Google chrome extension tabs.captureVisibleTab期间出错？在最近的Chrome更新之后

最近更新了chrome浏览器后，我使用的一个旧应用程序——书签管理器——停止了工作。更具体地说，获取缩略图截图的部分不起作用。 错误消息是

“制表期间出错。captureVisibleTab:无法访问url的内容。” "chrome://newtab/#20“。扩展清单必须请求对 访问此主机。“

据我所知，tabs.captureVisibleTab不应该在上面工作

铬：//

标签等

以下是manifest.json权限：

"permissions": [ "storage","bookmarks", "tabs", "history", "management", "unlimitedStorage", "chrome://favicon/", "http://*/*", "https://*/*","<all_urls>", "contextMenus", "notifications" ],

问题-大多数时候控制台都会触发此错误消息。每过一段时间，代码就会得到缩略图。据我所知，tabs.captureVisibleTab会在预定的时间之前触发

<> P>我会考虑有效的答案，无论是代码的直接修复（更好）还是一般的方向如何使它更可靠。 我的系统-Ubuntu 12.04，Chrome 24.0.1312.70

chrome.tabs.getSelected

不推荐使用chrome.tabs.query

不需要在chrome.tabs.captureVisibleTab中显式声明null（默认为null）

参考文献

---

如果这是导致问题的唯一原因，我将尝试并向上投票。我仍然必须通过chrome.tabs.query传递正确的id？在我看来，当我离开应用程序页面时，所有功能都会停止…感谢您的帮助-这与正常情况大不相同，但您不可能知道-code在backgorund.html中，而不是background.js中，并且不是根据版本2清单要求声明的

    function getThumbnail(url, showInfoWarning) {
    chrome.tabs.getSelected( null,function(tab) { 
      speeddial.storage.removeThumbnail(url);
        localStorage['requestThumbnail'] = tab.id+'|||'+url; 
        openInCurrent(url); 
    }); 
}

function makeThumbnail(url,captureDelay) {
setTimeout(function() 
{
    chrome.tabs.captureVisibleTab(null,{format:'png'},function(dataurl)
    {
        var canvas = document.createElementNS( "http://www.w3.org/1999/xhtml", "html:canvas" );
        var ctx = canvas.getContext('2d');      
        var img = document.createElement('img');
        img.onload = function()
        {
            try
            {
                resized_width = 480; 
                quality = 0.72;

                if          (localStorage['options.thumbnailQuality']=='low')       { resized_width = 360; quality = 0.75;  }
                if          (localStorage['options.thumbnailQuality']=='high')      { resized_width = 720; quality = 0.65;  }

                resized_height =  Math.ceil((resized_width/img.width)*img.height);
                canvas.width=resized_width
                canvas.height=resized_height
                ctx.drawImage(img,0,0,resized_width,resized_height);

                localStorage.setItem(url, dataurl);
      // SPEED DIAL DB 
      // var speeddialdb = {};
      // speeddialdb.storage = {};
      // speeddialdb.storage.db = null;
      // var dbSize = 1 * 1024 * 1024; // 2MB
      // speeddialdb.storage.db = null;
      // speeddialdb.storage.db = openDatabase('bookmarks', '1.0', 'Speeddial2', dbSize);

      // speeddialdb.storage.db.transaction(function(tx) {
      //   tx.executeSql('DELETE FROM thumbnails WHERE url = ?', [url],function(){
      //     tx.executeSql('INSERT INTO thumbnails (url, thumbnail) values (?, ?)', [url, canvas.toDataURL("image/jpeg",quality)], null ,function(tx, e){alert('Something unexpected happened: ' + e.message ) });  
      //   });
      // });
            }
            catch(e){console.log(e)}            
        }
        img.src=dataurl;
    });
}, captureDelay);
}

chrome.tabs.onUpdated.addListener(function(id,object,tab) {
    if (tab.selected && tab.url) {
        if (localStorage['requestThumbnail']!='' && localStorage['requestThumbnail']!="undefined" && typeof localStorage["requestThumbnail"]!='undefined') {
      var requestThumbnail = localStorage['requestThumbnail'].split('|||');

      if (requestThumbnail[0] == tab.id) { 
        if ( tab.status=="complete" ) { 
            if (tab.url.indexOf('mail.google.com')>-1 || tab.url.indexOf('twitter.com')>-1) 
            {
                makeThumbnail(requestThumbnail[1],1000); 
            } else {
                makeThumbnail(requestThumbnail[1],500); 
            }
            localStorage['requestThumbnail']='';
        }
        requestThumbnail = null;
      }

    } 
    }
});