background.js

(async () => { 

  // Define default prefs.
  let defaultPrefs = {
      "counter": 0,
      "templateFolder": "",
      "defaultImport": "",
      "menuCollapse": true,
      "toolbar": true,
      "popup": false,
      "keywordKey": "Tab",
      "shortcutModifier": "alt",
      "shortcutTypeAdv": false,
      "collapseState": ""
  }; 
  await preferences.init(defaultPrefs);

  // Migrate legacy prefs using the LegacyPrefs API.
  const legacyPrefBranch = "extensions.quicktext.";
  const prefNames = Object.keys(defaultPrefs);

  for (let prefName of prefNames) {
    let legacyValue = await messenger.LegacyPrefs.getUserPref(`${legacyPrefBranch}${prefName}`);    
    if (legacyValue !== null) {
      console.log(`Migrating legacy preference <${legacyPrefBranch}${prefName}> = <${legacyValue}>.`);
      
      // Store the migrated value in local storage.
      // Check out the MDN documentation at
      // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage
      // or use preference.js bundled with this API
      preferences.setPref(prefName, legacyValue);
      
      // Clear the legacy value.
      messenger.LegacyPrefs.clearUserPref(`${legacyPrefBranch}${prefName}`);
    }
  }

  // Allow to set defaultImport from user_prefs
  let defaultImportOverride = await messenger.LegacyPrefs.getUserPref(`${legacyPrefBranch}defaultImportOverride`);    
  if (defaultImportOverride !== null) {
    preferences.setPref("defaultImport", defaultImportOverride);
  }

  // Allow to override templateFolder from user_prefs
  let templateFolderOverride = await messenger.LegacyPrefs.getUserPref(`${legacyPrefBranch}templateFolderOverride`);    
  if (templateFolderOverride !== null) {
    preferences.setPref("templateFolder", templateFolderOverride);
  }

  messenger.NotifyTools.onNotifyBackground.addListener(async (info) => {
    switch (info.command) {
      case "setPref":
        preferences.setPref(info.pref, info.value);
        break;
      case "getPref":
        return await preferences.getPref(info.pref);
        break;
    }
  }); 
  
  // load add-on via WindowListener API
  messenger.WindowListener.registerChromeUrl([ 
    ["content",   "quicktext",           "chrome/content/"],
    ["resource",  "quicktext",           "chrome/"],
    ["locale",    "quicktext", "de",     "chrome/locale/de/"],
    ["locale",    "quicktext", "pt-BR",  "chrome/locale/pt_BR/"],
    ["locale",    "quicktext", "en-US",  "chrome/locale/en-US/"],
    ["locale",    "quicktext", "es",     "chrome/locale/es/"],
    ["locale",    "quicktext", "fr",     "chrome/locale/fr/"],
    ["locale",    "quicktext", "hu",     "chrome/locale/hu/"],
    ["locale",    "quicktext", "ja",     "chrome/locale/ja/"],
    ["locale",    "quicktext", "ru",     "chrome/locale/ru/"],
    ["locale",    "quicktext", "sv-SE",  "chrome/locale/sv-SE/"],
    ["locale",    "quicktext", "cs",     "chrome/locale/cs/"],
  ]);

  messenger.WindowListener.registerOptionsPage("chrome://quicktext/content/addonoptions.xhtml")
  
  messenger.WindowListener.registerWindow(
    "chrome://messenger/content/messengercompose/messengercompose.xhtml",
    "chrome://quicktext/content/scripts/messengercompose.js");
      
  messenger.WindowListener.registerWindow(
    "chrome://messenger/content/messenger.xhtml",
    "chrome://quicktext/content/scripts/messenger.js");

  browser.composeAction.onClicked.addListener(tab => { messenger.WindowListener.openOptionsDialog(tab.windowId); });
  browser.browserAction.onClicked.addListener(tab => { messenger.WindowListener.openOptionsDialog(tab.windowId); });

  messenger.WindowListener.startListening();
})();