Do not display options page when updating firefox

simple-translate/background.js

@@ -4,7 +4,9 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 //初回起動時にオプションページを表示して設定を初期化
-browser.runtime.onInstalled.addListener(function () {
+browser.runtime.onInstalled.addListener((details) => {
+    if (details.reason != 'install' && details.reason != 'update') return;
+
     browser.tabs.create({
         url: "options/options.html#information",
         active: false