Refactored FF code to align more w/ Chromium code for easier maintena…

…nce ↞ [auto-sync from https://github.com/adamlui/ai-web-extensions]

firefox/extension/lib/settings.js

@@ -1,23 +1,34 @@
 window.config = {}
 window.settings = {
 
-    controls: {
-        notifDisabled: { type: 'toggle',
-            label: chrome.i18n.getMessage('menuLabel_modeNotifs'),
-            helptip: chrome.i18n.getMessage('helptip_modeNotifs') }
+    controls: { // displays top-to-bottom in toolbar menu
+        get notifDisabled() { return { type: 'toggle',
+            label: window.settings.getMsg('menuLabel_modeNotifs'),
+            helptip: window.settings.getMsg('helptip_modeNotifs') }}
+    },
+
+    getMsg(key) {
+        return typeof chrome != 'undefined' && chrome.runtime ? chrome.i18n.getMessage(key)
+            : this.appProps.msgs[key] // assigned from app.msgs in userscript
     },
 
     load() {
         const keys = ( // original array if array, else new array from multiple args
             Array.isArray(arguments[0]) ? arguments[0] : Array.from(arguments))
-        return Promise.all(keys.map(key => // resolve promise when all keys load
-            new Promise(resolve => // resolve promise when single key value loads
-                chrome.storage.sync.get(key, result => { // load from browser extension storage
-                    window.config[key] = result[key] || false ; resolve()
-    }))))},
+        if (typeof chrome != 'undefined' && chrome.runtime) // asynchronously load from browser extension storage
+            return Promise.all(keys.map(key => // resolve promise when all keys load
+                new Promise(resolve => // resolve promise when single key value loads
+                    chrome.storage.sync.get(key, result => {
+                        window.config[key] = result[key] || false ; resolve()
+        })))) ; else // synchronously load from userscript manager storage
+            keys.forEach(key => window.config[key] = GM_getValue(this.appProps.configKeyPrefix + '_' + key, false))
+    },
 
     save(key, val) {
-        chrome.storage.sync.set({ [key]: val }) // save to browser extension storage
+        if (typeof chrome != 'undefined' && chrome.runtime) // save to browser extension storage
+            chrome.storage.sync.set({ [key]: val })
+        else // save to userscript manager storage
+            GM_setValue(this.appProps.configKeyPrefix + '_' + key, val)
         window.config[key] = val // save to memory
     }
 };