Firefox扩展无法访问本地存储

我有一个Chrome扩展程序，正在尝试适应FF。当我尝试访问本地存储时，代码失败。控制台中没有JS错误。我是FF的新手，所以问题可能是基本的。为什么执行停止var gettingItem = browser.local.storage.get();

另外，当我在FF中加载扩展程序时，没有看到像在Chrome中那样的选项菜单。如何打开选项窗格？

我的清单：

{
    "manifest_version": 2,
    "name": "My name's mod",
    "short_name": "Mod",
    "version": "1.2.0",
    "description": "Make the ",
    "web_accessible_resources": [
        "base-theme.css",
        "light-theme.css",
        "wider-theme.css",
        "nobg-theme.css"
    ],
    "permissions": [
        "storage",
        "cookies",
        "*://forums.site.com/*"
    ],
    "content_scripts": [{
        "js": [
            "cg-mod.js",
            "cg-forum-class.js",
            "cg-forum-writer.js",           
            "cg-onload.js"
        ],
        "matches": ["https://forums.site.com/*", "http://forums.site.com/*" ]
    }],
    "icons": { 
        "16": "icon16.png",
        "48": "icon48.png",
        "128": "icon128.png" },
    "options_ui": {
        "page": "options.html",
        "chrome_style": true
    }
}

这是第一个被调用的文件：

//https://stackoverflow.com/questions/2400935/browser-detection-in-javascript
function IsChrome(){
    var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    var isChrome = !!window.chrome && !isOpera;              // Chrome 1+
    return isChrome;
}

function IsFirefox()
{
    var isFirefox = typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
    return isFirefox;
}

function GetStorage( callback ){    

    var defaultOptions = {
        Theme: 'wider',
        ShowSignatures: true,
        TheNewlyArrived: false,
        Kickstarter: false,
        Recruitment: false,
        Off: false
    };

    if( IsChrome() )
    {
        chrome.storage.sync.get( defaultOptions, function(items) {
            console.log( "Get Storage for Chrome");
            console.log( items );
            callback( items );
        }); 
    }else if( IsFirefox() ) {
        console.log("is firefox: "+ IsFirefox());
        //browser.storage.sync.get
        var gettingItem = browser.local.storage.get();
        console.log(gettingItem);
        console.log("THE PROBLEM IS HERE ^^");
/*      gettingItem.then((items) => {
            console.log( "Get Storage for Firefox");
            callback( items );
        }); */
    }
}

然后在我的onload文件中，我有这个：

/*
Run these commands on startup.
*/

// link the custom CSS as a stylesheet to give it higher priority
function Onload( storage )
{
    console.log( "storage: ");
    console.log( storage );

    // If off is true, they don't want to load the extension...
    if( storage.Off )
        return;

    var link = document.createElement('link');
    if( IsChrome() ){
        link.href = chrome.extension.getURL( 'base-theme.css' );        
    } else if( IsFirefox() ) {
        link.href = browser.extension.getURL( 'base-theme.css' );       
    }
    link.type = 'text/css';
    link.rel = 'stylesheet';
    document.getElementsByTagName("head")[0].appendChild(link);

    var link = document.createElement('link');
    if( IsChrome() ){
        link.href = chrome.extension.getURL( storage.Theme +'-theme.css');
    } else if( IsFirefox() ) {
        link.href = browser.extension.getURL( storage.Theme +'-theme.css');
    }
    link.type = 'text/css';
    link.rel = 'stylesheet';
    document.getElementsByTagName("head")[0].appendChild(link);

    if( ! storage.ShowSignatures )
        ForumWriter.ToggleVisibility( 'Signature' );
}

console.log("get storage pre");
// Call the Google values through a callback
GetStorage( Onload );   
console.log("get storage post"); 

控制台显示：

Name says hello! (proves the files are loading in the right oder)
get storage pre  
is firefox: true