diff --git a/package-lock.json b/package-lock.json
index 9232671..c28ebaf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1137,6 +1137,12 @@
         "uri-js": "^4.2.1"
       }
     },
+    "ajv-errors": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/ajv-errors/-/ajv-errors-1.0.1.tgz",
+      "integrity": "sha512-DCRfO/4nQ+89p/RK43i8Ezd41EqdGIU4ld7nGF8OQ14oc/we5rEntLCUa7+jrn3nn83BosfwZA0wb4pon2o8iQ==",
+      "dev": true
+    },
     "ajv-keywords": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.2.0.tgz",
@@ -5367,6 +5373,12 @@
         "brorand": "^1.0.1"
       }
     },
+    "mime": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.0.tgz",
+      "integrity": "sha512-ikBcWwyqXQSHKtciCcctu9YfPbFYZ4+gbHEmE0Q8jzcTYQg5dHCr3g2wwAZjPoJfQVXZq6KXAjpXOTf5/cjT7w==",
+      "dev": true
+    },
     "mime-db": {
       "version": "1.36.0",
       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.36.0.tgz",
@@ -9705,6 +9717,30 @@
         }
       }
     },
+    "url-loader": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/url-loader/-/url-loader-1.1.2.tgz",
+      "integrity": "sha512-dXHkKmw8FhPqu8asTc1puBfe3TehOCo2+RmOOev5suNCIYBcT626kxiWg1NBVkwc4rO8BGa7gP70W7VXuqHrjg==",
+      "dev": true,
+      "requires": {
+        "loader-utils": "^1.1.0",
+        "mime": "^2.0.3",
+        "schema-utils": "^1.0.0"
+      },
+      "dependencies": {
+        "schema-utils": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
+          "integrity": "sha512-i27Mic4KovM/lnGsy8whRCHhc7VicJajAjTrYg11K9zfZXnYIt4k5F+kZkwjnrhKzLic/HLU4j11mjsz2G/75g==",
+          "dev": true,
+          "requires": {
+            "ajv": "^6.1.0",
+            "ajv-errors": "^1.0.0",
+            "ajv-keywords": "^3.1.0"
+          }
+        }
+      }
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
diff --git a/package.json b/package.json
index 04a1889..b3cf711 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "sass-loader": "^7.0.3",
     "style-loader": "^0.21.0",
     "uglifyjs-webpack-plugin": "^1.2.5",
+    "url-loader": "^1.1.2",
     "webextension-polyfill": "^0.3.1",
     "webpack": "^4.10.2",
     "webpack-cli": "^3.0.1",
diff --git a/src/common/translate.js b/src/common/translate.js
index 8734e91..6025ee0 100644
--- a/src/common/translate.js
+++ b/src/common/translate.js
@@ -1,86 +1,75 @@
-/* Copyright (c) 2017-2018 Sienori All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+let translationHistory = [];
 
-class Translate {
-  constructor() {
-    this.history = [];
-  }
+const getHistory = (sourceWord, sourceLang, targetLang) => {
+  const history = translationHistory.find(
+    history =>
+      history.sourceWord == sourceWord &&
+      history.sourceLang == sourceLang &&
+      history.targetLang == targetLang &&
+      history.result.statusText == "OK"
+  );
+  return history;
+};
 
-  getHistory(sourceWord, sourceLang, targetLang) {
-    const history = this.history.find(
-      history =>
-        history.sourceWord == sourceWord &&
-        history.sourceLang == sourceLang &&
-        history.targetLang == targetLang &&
-        history.result.statusText == "OK"
-    );
-    return history;
-  }
+const setHistory = (sourceWord, sourceLang, targetLang, formattedResult) => {
+  translationHistory.push({
+    sourceWord: sourceWord,
+    sourceLang: sourceLang,
+    targetLang: targetLang,
+    result: formattedResult
+  });
+};
 
-  setHistory(sourceWord, sourceLang, targetLang, formattedResult) {
-    this.history.push({
-      sourceWord: sourceWord,
-      sourceLang: sourceLang,
-      targetLang: targetLang,
-      result: formattedResult
-    });
-  }
+const sendRequest = (word, sourceLang, targetLang) => {
+  const url = `https://translate.googleapis.com/translate_a/single?client=gtx&sl=${sourceLang}&tl=${targetLang}&dt=t&dt=bd&dj=1&q=${encodeURIComponent(
+    word
+  )}`;
+  const xhr = new XMLHttpRequest();
+  xhr.responseType = "json";
+  xhr.open("GET", url);
+  xhr.send();
 
-  async translate(sourceWord, sourceLang = "auto", targetLang) {
-    sourceWord = sourceWord.trim();
-
-    const history = this.getHistory(sourceWord, sourceLang, targetLang);
-    if (history) return history.result;
-
-    const result = await this.sendRequest(sourceWord, sourceLang, targetLang);
-    const formattedResult = this.formatResult(result);
-    this.setHistory(sourceWord, sourceLang, targetLang, formattedResult);
-
-    return formattedResult;
-  }
-
-  sendRequest(word, sourceLang, targetLang) {
-    const url = `https://translate.googleapis.com/translate_a/single?client=gtx&sl=${sourceLang}&tl=${targetLang}&dt=t&dt=bd&dj=1&q=${encodeURIComponent(
-      word
-    )}`;
-    const xhr = new XMLHttpRequest();
-    xhr.responseType = "json";
-    xhr.open("GET", url);
-    xhr.send();
-
-    return new Promise((resolve, reject) => {
-      xhr.onload = () => {
-        resolve(xhr);
-      };
-      xhr.onerror = () => {
-        resolve(xhr);
-      };
-    });
-  }
-
-  formatResult(result) {
-    const resultData = {
-      resultText: "",
-      candidateText: "",
-      sourceLanguage: "",
-      percentage: 0,
-      statusText: ""
+  return new Promise((resolve, reject) => {
+    xhr.onload = () => {
+      resolve(xhr);
     };
+    xhr.onerror = () => {
+      resolve(xhr);
+    };
+  });
+};
 
-    resultData.statusText = result.statusText;
-    if (resultData.statusText !== "OK") return resultData;
+const formatResult = result => {
+  const resultData = {
+    resultText: "",
+    candidateText: "",
+    sourceLanguage: "",
+    percentage: 0,
+    statusText: ""
+  };
 
-    resultData.sourceLanguage = result.response.src;
-    resultData.percentage = result.response.confidence;
-    resultData.resultText = result.response.sentences.map(sentence => sentence.trans).join("");
-    if (result.response.dict) {
-      resultData.candidateText = result.response.dict
-        .map(dict => `${dict.pos}${dict.pos != "" ? ": " : ""}${dict.terms.join(", ")}\n`)
-        .join("");
-    }
+  resultData.statusText = result.statusText;
+  if (resultData.statusText !== "OK") return resultData;
 
-    return resultData;
+  resultData.sourceLanguage = result.response.src;
+  resultData.percentage = result.response.confidence;
+  resultData.resultText = result.response.sentences.map(sentence => sentence.trans).join("");
+  if (result.response.dict) {
+    resultData.candidateText = result.response.dict
+      .map(dict => `${dict.pos}${dict.pos != "" ? ": " : ""}${dict.terms.join(", ")}\n`)
+      .join("");
   }
-}
+
+  return resultData;
+};
+
+export default async (sourceWord, sourceLang = "auto", targetLang) => {
+  sourceWord = sourceWord.trim();
+  const history = getHistory(sourceWord, sourceLang, targetLang);
+  if (history) return history.result;
+
+  const result = await sendRequest(sourceWord, sourceLang, targetLang);
+  const formattedResult = formatResult(result);
+  setHistory(sourceWord, sourceLang, targetLang, formattedResult);
+  return formattedResult;
+};
diff --git a/src/content/components/TranslateButton.js b/src/content/components/TranslateButton.js
new file mode 100644
index 0000000..d8081ac
--- /dev/null
+++ b/src/content/components/TranslateButton.js
@@ -0,0 +1,37 @@
+import React from "react";
+import { getSettings } from "src/settings/settings";
+import "../styles/TranslateButton.scss";
+
+const calcPosition = () => {
+  const buttonSize = parseInt(getSettings("buttonSize"));
+  const offset = 10;
+  switch (getSettings("buttonPosition")) {
+    case "rightUp":
+      return { top: -buttonSize - offset, left: offset };
+    case "rightDown":
+      return { top: offset, left: offset };
+    case "leftUp":
+      return { top: -buttonSize - offset, left: -buttonSize - offset };
+    case "leftDown":
+      return { top: offset, left: -buttonSize - offset };
+  }
+};
+
+export default props => {
+  const { position, shouldShow } = props;
+  const buttonSize = parseInt(getSettings("buttonSize"));
+  const { top, left } = calcPosition();
+  const buttonStyle = {
+    height: buttonSize,
+    width: buttonSize,
+    top: top + position.y,
+    left: left + position.x
+  };
+  return (
+    <button
+      style={buttonStyle}
+      className={`simple-translate-button ${shouldShow ? "isShow" : ""}`}
+      onClick={props.handleButtonClick}
+    />
+  );
+};
diff --git a/src/content/components/TranslateContainer.js b/src/content/components/TranslateContainer.js
new file mode 100644
index 0000000..2cd5320
--- /dev/null
+++ b/src/content/components/TranslateContainer.js
@@ -0,0 +1,181 @@
+import React, { Component } from "react";
+import browser from "webextension-polyfill";
+import translate from "src/common/translate";
+import { initSettings, getSettings, handleSettingsChange } from "src/settings/settings";
+import TranslateButton from "./TranslateButton";
+import TranslatePanel from "./TranslatePanel";
+import "../styles/TranslateContainer.scss";
+
+const getSelectedText = () => {
+  const element = document.activeElement;
+  const isInTextField = element.tagName === "INPUT" || element.tagName === "TEXTAREA";
+  const selectedText = isInTextField
+    ? element.value.substring(element.selectionStart, element.selectionEnd)
+    : window.getSelection().toString();
+  return selectedText;
+};
+
+const getSelectedPosition = () => {
+  const element = document.activeElement;
+  const isInTextField = element.tagName === "INPUT" || element.tagName === "TEXTAREA";
+  const selectedRect = isInTextField
+    ? element.getBoundingClientRect()
+    : window
+        .getSelection()
+        .getRangeAt(0)
+        .getBoundingClientRect();
+  const selectedPosition = {
+    x: selectedRect.left + selectedRect.width / 2,
+    y: selectedRect.bottom
+  };
+  return selectedPosition;
+};
+
+const translateText = async text => {
+  const targetLang = getSettings("targetLang");
+  const result = await translate(text, "auto", targetLang);
+  return result;
+};
+
+const matchesTargetLang = async selectedText => {
+  const targetLang = getSettings("targetLang");
+  //detectLanguageで判定
+  const langInfo = await browser.i18n.detectLanguage(selectedText);
+  const matchsLangsByDetect = langInfo.isReliable && langInfo.languages[0].language === targetLang;
+  if (matchsLangsByDetect) return true;
+
+  //先頭100字を翻訳にかけて判定
+  const partSelectedText = selectedText.substring(0, 100);
+  const result = await translateText(partSelectedText);
+  const matchsLangs = targetLang === result.sourceLanguage && result.percentage > 0;
+  return matchsLangs;
+};
+
+export default class TranslateContainer extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      isInit: false,
+      shouldShowButton: false,
+      buttonPosition: { x: 0, y: 0 },
+      shouldShowPanel: false,
+      panelPosition: { x: 0, y: 0 },
+      resultText: "",
+      candidateText: ""
+    };
+    this.selectedText = "";
+    this.init();
+  }
+
+  init = async () => {
+    await initSettings();
+    this.setState({ isInit: true });
+    document.addEventListener("mouseup", e => setTimeout(() => this.handleMouseUp(e), 0));
+    document.addEventListener("keydown", this.handleKeyDown);
+    browser.storage.onChanged.addListener(handleSettingsChange);
+    browser.runtime.onMessage.addListener(this.handleMessage);
+  };
+
+  handleMessage = async request => {
+    switch (request.message) {
+      case "getTabInfo":
+        const tabInfo = { url: location.href, selectedText: this.selectedText };
+        return tabInfo;
+      case "translateSelectedText":
+        this.selectedText = getSelectedText();
+        const position = getSelectedPosition();
+        if (this.selectedText.length === 0) return;
+        this.hideButton();
+        this.showPanel(position);
+        break;
+    }
+  };
+
+  handleKeyDown = e => {
+    if (e.key === "Escape") {
+      this.hideButton();
+      this.hidePanel();
+    }
+  };
+
+  showButton = position => {
+    this.setState({ shouldShowButton: true, buttonPosition: position });
+  };
+
+  hideButton = () => {
+    this.setState({ shouldShowButton: false });
+  };
+
+  handleButtonClick = e => {
+    const position = { x: e.clientX, y: e.clientY };
+    this.showPanel(position);
+    this.hideButton();
+  };
+
+  showPanel = async position => {
+    const result = await translateText(this.selectedText);
+    this.setState({
+      shouldShowPanel: true,
+      panelPosition: position,
+      resultText: result.resultText,
+      candidateText: getSettings("ifShowCandidate") ? result.candidateText : ""
+    });
+  };
+
+  hidePanel = () => {
+    this.setState({ shouldShowPanel: false });
+  };
+
+  handleMouseUp = e => {
+    const isLeftClick = e.button === 0;
+    const isInPasswordField = e.target.tagName === "INPUT" && e.target.type === "password";
+    const isInThisElement = document.querySelector("#simple-translate").contains(e.target);
+    if (!isLeftClick) return;
+    if (isInPasswordField) return;
+    if (isInThisElement) return;
+    this.hideButton();
+    this.hidePanel();
+
+    this.selectedText = getSelectedText();
+    const position = { x: e.clientX, y: e.clientY };
+
+    if (this.selectedText.length === 0) return;
+    this.handleTextSelect(position);
+  };
+
+  handleTextSelect = async position => {
+    const onSelectBehavior = getSettings("whenSelectText");
+    if (onSelectBehavior === "dontShowButton") return;
+
+    if (getSettings("ifCheckLang")) {
+      const matchesLang = await matchesTargetLang(this.selectedText);
+      if (matchesLang) return;
+    }
+
+    if (onSelectBehavior === "showButton") {
+      this.showButton(position);
+    } else if (onSelectBehavior === "showPanel") {
+      this.showPanel(position);
+    }
+  };
+
+  render = () => {
+    if (!this.state.isInit) return null;
+    return (
+      <div>
+        <TranslateButton
+          shouldShow={this.state.shouldShowButton}
+          position={this.state.buttonPosition}
+          handleButtonClick={this.handleButtonClick}
+        />
+        <TranslatePanel
+          shouldShow={this.state.shouldShowPanel}
+          position={this.state.panelPosition}
+          resultText={this.state.resultText}
+          candidateText={this.state.candidateText}
+          hidePanel={this.hidePanel}
+        />
+      </div>
+    );
+  };
+}
diff --git a/src/content/components/TranslatePanel.js b/src/content/components/TranslatePanel.js
new file mode 100644
index 0000000..aa784fc
--- /dev/null
+++ b/src/content/components/TranslatePanel.js
@@ -0,0 +1,116 @@
+import React, { Component } from "react";
+import ReactDOM from "react-dom";
+import { getSettings } from "src/settings/settings";
+import "../styles/TranslatePanel.scss";
+
+export default class TranslatePanel extends Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      panelPosition: { x: 0, y: 0 },
+      panelWidth: 0,
+      panelHeight: 0,
+      shouldResize: true
+    };
+    this.isFirst = true;
+  }
+
+  calcPosition = () => {
+    const maxWidth = parseInt(getSettings("width"));
+    const maxHeight = parseInt(getSettings("height"));
+    const wrapper = ReactDOM.findDOMNode(this.refs.wrapper);
+    const panelWidth = Math.min(wrapper.clientWidth, maxWidth);
+    const panelHeight = Math.min(wrapper.clientHeight, maxHeight);
+    const windowWidth = document.documentElement.clientWidth;
+    const windowHeight = document.documentElement.clientHeight;
+    const offset = 10;
+
+    //TODO: パネルの表示位置オプション
+    let position = {
+      x: this.props.position.x - panelWidth / 2,
+      y: this.props.position.y + offset
+    };
+
+    if (position.x + panelWidth > windowWidth - offset) {
+      position.x = windowWidth - panelWidth - offset;
+    }
+    if (position.y + panelHeight > windowHeight - offset) {
+      position.y = windowHeight - panelHeight - offset;
+    }
+    if (position.x < 0 + offset) {
+      position.x = offset;
+    }
+    if (position.y < 0 + offset) {
+      position.y = offset;
+    }
+    return position;
+  };
+
+  calcSize = () => {
+    const wrapper = ReactDOM.findDOMNode(this.refs.wrapper);
+    const wrapperWidth = wrapper.clientWidth;
+    const wrapperHeight = wrapper.clientHeight;
+    return { panelWidth: wrapperWidth, panelHeight: wrapperHeight };
+  };
+
+  componentWillReceiveProps = nextProps => {
+    const isChangedContents =
+      this.props.resultText !== nextProps.resultText ||
+      this.props.candidateText !== nextProps.candidateText;
+
+    if (isChangedContents && nextProps.shouldShow) this.setState({ shouldResize: true });
+  };
+
+  componentDidUpdate = () => {
+    if (!this.state.shouldResize || !this.props.shouldShow) return;
+    const panelPosition = this.calcPosition();
+    const { panelWidth, panelHeight } = this.calcSize();
+    this.setState({
+      shouldResize: false,
+      panelPosition: panelPosition,
+      panelWidth: panelWidth,
+      panelHeight: panelHeight
+    });
+  };
+
+  render = () => {
+    const { width, height } = this.state.shouldResize
+      ? { width: parseInt(getSettings("width")), height: parseInt(getSettings("height")) }
+      : { width: this.state.panelWidth, height: this.state.panelHeight };
+
+    const panelStyles = {
+      width: width,
+      height: height,
+      top: this.state.panelPosition.y,
+      left: this.state.panelPosition.x,
+      fontSize: parseInt(getSettings("fontSize")),
+      backgroundColor: getSettings("bgColor")
+    };
+    const wrapperStyles = {
+      overflow: this.state.shouldResize ? "hidden" : "auto"
+    };
+    const resultStyles = {
+      color: getSettings("resultFontColor")
+    };
+    const candidateStyles = {
+      color: getSettings("candidateFontColor")
+    };
+
+    return (
+      <div
+        className={`simple-translate-panel ${this.props.shouldShow ? "isShow" : ""}`}
+        ref="panel"
+        style={panelStyles}
+      >
+        <div className="simple-translate-result-wrapper" ref="wrapper" style={wrapperStyles}>
+          <p className="simple-translate-result" style={resultStyles}>
+            {this.props.resultText}
+          </p>
+          <p className="simple-translate-candidate" style={candidateStyles}>
+            {this.props.candidateText}
+          </p>
+        </div>
+      </div>
+    );
+  };
+}
diff --git a/src/content/index.js b/src/content/index.js
new file mode 100644
index 0000000..3b92b86
--- /dev/null
+++ b/src/content/index.js
@@ -0,0 +1,6 @@
+import React from "react";
+import ReactDOM from "react-dom";
+import TranslateContainer from "./components/TranslateContainer";
+
+document.body.insertAdjacentHTML("afterend", "<div id='simple-translate'></div>");
+ReactDOM.render(<TranslateContainer />, document.getElementById("simple-translate"));
diff --git a/src/content/styles/TranslateButton.scss b/src/content/styles/TranslateButton.scss
new file mode 100644
index 0000000..69f1fb1
--- /dev/null
+++ b/src/content/styles/TranslateButton.scss
@@ -0,0 +1,40 @@
+#simple-translate {
+  .simple-translate-button {
+    all: initial;
+    background-color: #fff;
+    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(0, 0, 0, 0.08);
+    border-radius: 10%;
+    background-image: url("../../icons/512.png");
+    background-size: 75%;
+    background-repeat: no-repeat;
+    background-position: center;
+    height: 22px;
+    width: 22px;
+    position: fixed;
+    z-index: 2147483647;
+    cursor: pointer;
+
+    transition-property: opacity, visibility;
+    transition-duration: 200ms;
+    opacity: 0;
+    visibility: hidden;
+    &.isShow {
+      opacity: 1;
+      visibility: visible;
+      transition-duration: 0ms;
+      animation: simple-translate-showButton 200ms;
+    }
+  }
+
+  @keyframes simple-translate-showButton {
+    0% {
+      transform: scale3d(1, 1, 1);
+    }
+    50% {
+      transform: scale3d(1.1, 1.1, 1.1);
+    }
+    100% {
+      transform: scale3d(1, 1, 1);
+    }
+  }
+}
diff --git a/src/content/styles/TranslateContainer.scss b/src/content/styles/TranslateContainer.scss
new file mode 100644
index 0000000..0f5aadf
--- /dev/null
+++ b/src/content/styles/TranslateContainer.scss
@@ -0,0 +1,8 @@
+:root {
+  --simple-translate-main-text: #0c0c0d;
+  --simple-translate-sub-text: #737373;
+  --simple-translate-line: #ededf0;
+  --simple-translate-button: #d7d7db;
+  --simple-translate-highlight: #5595ff;
+  --simple-translate-main-bg: #ffffff;
+}
diff --git a/src/content/styles/TranslatePanel.scss b/src/content/styles/TranslatePanel.scss
new file mode 100644
index 0000000..b096e25
--- /dev/null
+++ b/src/content/styles/TranslatePanel.scss
@@ -0,0 +1,56 @@
+#simple-translate {
+  .simple-translate-panel {
+    all: initial;
+    position: fixed;
+    background-color: var(--simple-translate-main-bg);
+    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(0, 0, 0, 0.08);
+    border-radius: 3px;
+    z-index: 2147483646;
+
+    transition-property: opacity, visibility;
+    transition-duration: 200ms;
+    opacity: 0;
+    visibility: hidden;
+    &.isShow {
+      opacity: 1;
+      visibility: visible;
+    }
+
+    .simple-translate-result-wrapper {
+      padding: 10px 18px;
+      box-sizing: border-box;
+      width: max-content;
+      height: max-content;
+      max-width: 100%;
+      max-height: 100%;
+      p {
+        all: initial;
+        display: block;
+        margin: 0;
+        font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto", "Arial",
+          "Helvetica", sans-serif !important;
+        text-align: left;
+        word-wrap: break-word;
+        font-size: inherit;
+        line-height: 150%;
+        visibility: inherit;
+        opacity: inherit;
+
+        &::-moz-selection {
+          background: var(--simple-translate-line);
+        }
+
+        &.simple-translate-result {
+          color: var(--simple-translate-main-text);
+        }
+        &.simple-translate-candidate {
+          color: var(--simple-translate-sub-text);
+          margin-top: 1em;
+          &:empty {
+            margin-top: 0;
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/src/manifest-chrome.json b/src/manifest-chrome.json
index 136b020..1630c45 100644
--- a/src/manifest-chrome.json
+++ b/src/manifest-chrome.json
@@ -43,8 +43,7 @@
     {
       "all_frames": true,
       "matches": ["http://*/*", "https://*/*", "<all_urls>"],
-      "css": ["content/simple-translate.css"],
-      "js": ["content/simple-translate.js"]
+      "js": ["content/content.js"]
     }
   ]
 }
diff --git a/src/manifest-firefox.json b/src/manifest-firefox.json
index 327e438..ecb9501 100644
--- a/src/manifest-firefox.json
+++ b/src/manifest-firefox.json
@@ -49,8 +49,7 @@
     {
       "all_frames": true,
       "matches": ["http://*/*", "https://*/*", "<all_urls>"],
-      "css": ["content/simple-translate.css"],
-      "js": ["content/simple-translate.js"]
+      "js": ["content/content.js"]
     }
   ]
 }
diff --git a/webpack.config.dev.js b/webpack.config.dev.js
index acc85f6..bbcc11f 100644
--- a/webpack.config.dev.js
+++ b/webpack.config.dev.js
@@ -1,4 +1,5 @@
-/* Copyright (c) 2018 Kamil Mikosz 
+/* Copyright (c) 2018 Kamil Mikosz
+ * Copyright (c) 2019 Sienori
  * Released under the MIT license.
  * see https://opensource.org/licenses/MIT */
 
@@ -72,6 +73,11 @@ const generalConfig = {
             }
           }
         ]
+      },
+      {
+        test: /\.(png|jpg|gif)$/,
+        loader: "url-loader",
+        options: {}
       }
     ]
   }
diff --git a/webpack.config.dist.js b/webpack.config.dist.js
index 5ed5c13..e279064 100644
--- a/webpack.config.dist.js
+++ b/webpack.config.dist.js
@@ -79,6 +79,11 @@ const generalConfig = {
             }
           }
         ]
+      },
+      {
+        test: /\.(png|jpg|gif)$/,
+        loader: "url-loader",
+        options: {}
       }
     ]
   }
diff --git a/webpack.utils.js b/webpack.utils.js
index 404246f..b346f84 100644
--- a/webpack.utils.js
+++ b/webpack.utils.js
@@ -34,7 +34,7 @@ const getEntry = (sourceDir = "src") => {
   return {
     popup: path.resolve(__dirname, `${sourceDir}/popup/index.js`),
     options: path.resolve(__dirname, `${sourceDir}/options/index.js`),
-    content: path.resolve(__dirname, `${sourceDir}/content/simple-translate.js`),
+    content: path.resolve(__dirname, `${sourceDir}/content/index.js`),
     background: path.resolve(__dirname, `${sourceDir}/background/background.js`)
   };
 };
@@ -49,10 +49,6 @@ const getCopyPlugins = (browserDir, outputDir = "dev", sourceDir = "src") => [
       from: `${sourceDir}/_locales`,
       to: path.resolve(__dirname, `${outputDir}/${browserDir}/_locales`)
     },
-    {
-      from: `${sourceDir}/content/simple-translate.css`,
-      to: path.resolve(__dirname, `${outputDir}/${browserDir}/content/simple-translate.css`)
-    },
     {
       from: `${sourceDir}/manifest-chrome.json`,
       to: path.resolve(__dirname, `${outputDir}/${browserDir}/manifest.json`)
@@ -70,10 +66,6 @@ const getFirefoxCopyPlugins = (browserDir, outputDir = "dev", sourceDir = "src")
       from: `${sourceDir}/_locales`,
       to: path.resolve(__dirname, `${outputDir}/${browserDir}/_locales`)
     },
-    {
-      from: `${sourceDir}/content/simple-translate.css`,
-      to: path.resolve(__dirname, `${outputDir}/${browserDir}/content/simple-translate.css`)
-    },
     {
       from: `${sourceDir}/manifest-firefox.json`,
       to: path.resolve(__dirname, `${outputDir}/${browserDir}/manifest.json`)