diff --git a/src/content/simple-translate.css b/src/content/simple-translate.css
deleted file mode 100644
index ccea634..0000000
--- a/src/content/simple-translate.css
+++ /dev/null
@@ -1,95 +0,0 @@
-: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;
-}
-
-#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;
-  left: 0px;
-  top: 0px;
-  display: none;
-  cursor: pointer;
-  animation-duration: 200ms;
-  animation-name: simple-translate-showButton;
-}
-
-#simple-translate-panel {
-  all: initial;
-  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;
-  min-height: 20px;
-  max-height: 200px;
-  line-height: 150%;
-  height: auto;
-  min-width: 10px;
-  max-width: 300px;
-  position: fixed;
-  padding: 10px 18px;
-  z-index: 2147483646;
-  left: 0px;
-  top: 0px;
-  display: none;
-  overflow-y: auto;
-}
-
-#simple-translate-panel p {
-  all: initial;
-  font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto", "Arial", "Helvetica",
-    sans-serif !important;
-  text-align: left;
-  display: block;
-  font-size: inherit;
-  color: var(--simple-translate-main-text);
-  margin: 0;
-  word-wrap: break-word;
-}
-
-#simple-translate-panel p::-moz-selection {
-  background: var(--simple-translate-line);
-}
-
-#simple-translate-panel .candidate {
-  color: var(--simple-translate-sub-text);
-  margin-top: 1em;
-}
-
-#simple-translate-panel .candidate:empty {
-  margin-top: 0;
-}
-
-@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);
-  }
-}
-
-@keyframes simple-translate-fadein {
-  from {
-    opacity: 0;
-  }
-  to {
-    opacity: 1;
-  }
-}
diff --git a/src/content/simple-translate.js b/src/content/simple-translate.js
deleted file mode 100644
index a11634c..0000000
--- a/src/content/simple-translate.js
+++ /dev/null
@@ -1,227 +0,0 @@
-/* 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/. */
-
-document.body.insertAdjacentHTML(
-  "afterend",
-  "<div id='simple-translate-button'></div><div id='simple-translate-panel'><p>...</p></div>"
-); //bodyの直後にボタン配置
-var button = document.getElementById("simple-translate-button");
-var panel = document.getElementById("simple-translate-panel");
-var selectionWord;
-var clickPosition;
-
-const S = new settingsObj();
-const T = new Translate();
-S.init();
-window.addEventListener("mouseup", Select, false);
-//テキスト選択時の処理 ダブルクリックした時2回処理が走るのを何とかしたい
-async function Select(e) {
-  hidePanel(e);
-  if (e.target.tagName == "INPUT" && e.target.type == "password") return;
-
-  setTimeout(async () => {
-    //誤動作防止の為ディレイを設ける
-    //選択文の取得 テキストフィールド内を選択した場合にも対応
-    const isTextField = e.target.tagName == "INPUT" || e.target.tagName == "TEXTAREA";
-    if (isTextField)
-      selectionWord = e.target.value.substring(e.target.selectionStart, e.target.selectionEnd);
-    else selectionWord = String(window.getSelection());
-
-    //選択文が存在し，パネル外を左クリックした場合は翻訳する
-    const existsSelectionWord = selectionWord.length !== 0;
-    const isLeftClick = e.button == 0;
-    const isPanelOutside =
-      e.target.id !== "simple-translate-panel" &&
-      e.target.parentElement.id !== "simple-translate-panel";
-    const shouldTranslate = existsSelectionWord && isLeftClick && isPanelOutside;
-    if (!shouldTranslate) return;
-
-    clickPosition = e;
-
-    //選択した言語が翻訳先言語と異なるか判定
-    const shouldShowButtons = S.get().whenSelectText != "dontShowButton";
-    if (S.get().ifCheckLang && shouldShowButtons) {
-      const shouldTranslate = await checkLang(selectionWord, "auto", S.get().targetLang);
-      if (!shouldTranslate) return;
-    }
-
-    switch (S.get().whenSelectText) {
-      case "showButton":
-        if (selectionWord.length == 0) return;
-        popupButton(e);
-        break;
-      case "showPanel":
-        translate(selectionWord, "auto", S.get().targetLang);
-        if (selectionWord.length == 0) return;
-        showPanel(e);
-        break;
-      case "dontShowButton":
-        break;
-    }
-  }, 0);
-}
-
-//選択テキストの言語をチェックして返す ターゲットとソースの言語が不一致ならtrue
-async function checkLang(sourceWord, sourceLang, targetLang) {
-  //detectLanguageで判定 ターゲットとソースが一致したらfalse
-  const langInfo = await browser.i18n.detectLanguage(sourceWord);
-  if (langInfo.isReliable && langInfo.languages[0].language == targetLang) return false;
-
-  //先頭100字を翻訳にかけて判定
-  sourceWord = sourceWord.substr(0, 100);
-  const resultData = await T.translate(sourceWord, sourceLang, targetLang);
-  const shouldTranslate =
-    S.get().targetLang != resultData.sourceLanguage && resultData.percentage > 0;
-  return shouldTranslate;
-}
-
-//ボタンを表示
-function popupButton(e) {
-  let topPosition = 10;
-  let leftPosition = 10;
-  let buttonSize = S.get().buttonSize;
-
-  switch (S.get().buttonPosition) {
-    case "rightUp":
-      topPosition = -1 * buttonSize - 10;
-      break;
-    case "rightDown":
-      break;
-    case "leftUp":
-      topPosition = -1 * buttonSize - 10;
-      leftPosition = -1 * buttonSize - 10;
-      break;
-    case "leftDown":
-      leftPosition = -1 * buttonSize - 10;
-      break;
-  }
-
-  button.style.left = e.clientX + leftPosition + "px";
-  button.style.top = e.clientY + topPosition + "px";
-  button.style.width = S.get().buttonSize + "px";
-  button.style.height = S.get().buttonSize + "px";
-  button.style.display = "block";
-}
-button.addEventListener(
-  "click",
-  function(e) {
-    translate(selectionWord, "auto", S.get().targetLang);
-    showPanel(e);
-  },
-  false
-);
-
-async function translate(sourceWord, sourceLang, targetLang) {
-  const result = await T.translate(sourceWord, sourceLang, targetLang);
-  showResult(result);
-  panelPosition(clickPosition);
-}
-
-function showResult(result) {
-  panel.innerHTML = "<p class=result></p><p class=candidate>";
-  const resultArea = panel.getElementsByClassName("result")[0];
-  const candidateArea = panel.getElementsByClassName("candidate")[0];
-
-  resultArea.innerText = result.resultText;
-  if (S.get().ifShowCandidate) candidateArea.innerText = result.candidateText;
-  if (result.statusText == "Service Unavailable")
-    candidateArea.innerText = browser.i18n.getMessage("unavailableError");
-}
-
-//パネル表示
-function showPanel(e) {
-  clickPosition = e;
-  panel.style.display = "block";
-  panelPosition(e);
-}
-
-//パネル非表示
-function hidePanel(e) {
-  button.style.display = "none"; //ボタンを非表示
-  if (
-    e.target.id !== "simple-translate-panel" &&
-    e.target.parentElement.id !== "simple-translate-panel"
-  ) {
-    //パネル以外の場所をクリックでパネルを非表示
-    panel.style.display = "none";
-    panel.innerHTML = "<p>...</p>";
-  }
-}
-
-//Esc押下でパネルを閉じる
-document.addEventListener("keydown", e => {
-  if (e.key == "Escape") hidePanel(e);
-});
-
-//パネルがウィンドウ外にはみ出る時に位置を調整
-function panelPosition(e) {
-  var p = new Object();
-  panel.style.width = S.get().width + "px"; //300px
-  var panelHeight = panel.clientHeight;
-  var panelWidth = parseInt(
-    window.getComputedStyle(panel.getElementsByTagName("p")[0], null).width
-  );
-  //一旦パネルの横幅を300にしてpの横幅を取得
-
-  if (e.clientX + panelWidth > window.innerWidth - 80) {
-    p.x = window.innerWidth - panelWidth - 80;
-  } else {
-    p.x = e.clientX;
-  }
-  if (e.clientY + panelHeight > window.innerHeight - 30) {
-    p.y = window.innerHeight - panelHeight - 30;
-  } else {
-    p.y = e.clientY;
-  }
-  panel.style.width = "auto"; //panelWidth + 'px';
-  panel.style.top = p.y + "px";
-  panel.style.left = p.x + "px";
-
-  panel.style.maxWidth = S.get().width + "px";
-  panel.style.maxHeight = S.get().height + "px";
-  panel.style.fontSize = S.get().fontSize + "px";
-  panel.getElementsByClassName("result")[0].style.color = S.get().resultFontColor;
-  panel.getElementsByClassName("candidate")[0].style.color = S.get().candidateFontColor;
-  panel.style.backgroundColor = S.get().bgColor;
-}
-
-//スクリプトからのメッセージに返信
-browser.runtime.onMessage.addListener(function(request) {
-  switch (request.message) {
-    case "fromPopup":
-      return sendToPopup();
-      break;
-    case "showPanelFromMenu":
-      showPanelFromMenu();
-      break;
-  }
-});
-
-//popupにテキストとurlを返す
-function sendToPopup() {
-  return Promise.resolve({
-    word: String(window.getSelection()),
-    url: window.location.href
-  });
-}
-
-//コンテキストメニュークリックでパネルを表示
-function showPanelFromMenu() {
-  button.style.display = "none";
-
-  //キャレットブラウズモードに対応
-  const isTextField =
-    document.activeElement.tagName == "INPUT" || document.activeElement.tagName == "TEXTAREA";
-  if (isTextField)
-    selectionWord = document.activeElement.value.substring(
-      document.activeElement.selectionStart,
-      document.activeElement.selectionEnd
-    );
-  else selectionWord = String(window.getSelection());
-  if (typeof clickPosition == "undefined") clickPosition = { clientX: 0, clientY: 0 };
-
-  translate(selectionWord, "auto", S.get().targetLang);
-  showPanel(clickPosition);
-}