// Открывать загрузки в табе ...................................................................................
const trueDownloadsImg = "data:image/x-icon;base64,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";
const falseDownloadsImg = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAAsTAAALEwEAmpwYAAAABGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6QAAdTAAAOpgAAA6mAAAF2+SX8VGAAACmElEQVR42oyU3UtUQRiHn9k9c47Ho+4uhrkthmUfkHeB91GJ1paiJl0EQZd9U3f+E1EX0b8QEUQX0ScZWd0E3VhBrWJFuZuEqyLsOTtnznSxx9rSzPdq5p13nhl+729GTBXL/BUJwAFcwAZEnDdAFagAARDVb7JYHQ6QBTKsHWWgGAPXBblAZu/ubTdUQ6YnKWslWoVIv/z6zYeZ08DCRkA2QPOW7T2dXTuwLAsMhDrk03Shp77mfyABkE6laGluRgiBACJjSKXSf9T8D1RbsBJIy0IIgcGQMAYrKfhn/b9BFtKWv1sWGZKJ5LqgJNAQiyyB1hpI4ti/pYiiCEvKlWlrbIcwFt23YkgH4NWf4DV5OI4DQmCMwWiN53n1FsnF42Xgq5gqljPA9u7OjjvupmxHUypF++Z2duzsIp3O1DQyhkhr5svzFAoFSsUSy0uL6KW5z29nZkeAaSt2a/Xy2Nit8RevLmS3bJUtqRSNXiOOLX+BwlCTTmfY091NLpujNPtF5fvP3IxdrizAB2bPnjt/r21zm3g6PnHe3tQqGxwHy5KIhMBEBoTCMQalAsJqJTh18sS1oeFjD32liysaaWDRV3pydPQ4rtMQPh6fuNjouo7luiREgshEGBPhhyHzc9+DwXz/1YGh4fu+0u+ARUCvtD8EFnylJ/MDg5G0ZfT42cSlnN3peF4TRkWoasCPuWLl6OH+a4fyRx4ENUg5vsgfPgqBcqD0u96+wwYET5+/vNjWnnONiSh9+1rJ9x28cqC3/1Gg9Pt6yFqG1EC5Gur3vX2HsG2pbt+5exYDI0OD1/ftP/ikGq6GAIg1/iNik6Ydmdzl2nI3QKWqPgRKf4xfvt7oE9HAQqD0ZKB0Ic75sYv1Wht+DgB8pQ6678CoOAAAAABJRU5ErkJggg==";


// Отслеживать начало загрузки и запускать нужные функции ......................................................
var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
observerService.addObserver(myDownloadObserver, "dl-start", false);

function myDownloadObserver(subject, topic, state ) {
     if ( topic == "dl-start" ) {
          if ( !custombuttons.getPrefs("browser.download.manager.showWhenStarting") && 
               custombuttons.getPrefs("browser.download.useToolkitUI") ) {
                    
               downloadManagerInTab(false);
               }
          }         
};


// Отслеживать все команды связные с загрузкой и запускать нужные функции и команды .............................
function getCommand(e) {
     var command = e.target.getAttribute("oncommand");
     if ( command == 'DownloadsIndicatorView.onCommand(event);' || command == 'BrowserDownloadsUI();' || 
          command == 'DownloadsPanel.showDownloadsHistory();') {
          e.preventDefault();
          e.stopPropagation();
          
          downloadManagerInTab(true);
     }
     if ( command == "performCommand('cmd_removeFromList');" || command == 'clearDownloadList();') {
          document.getElementById("Browser:Reload").doCommand();
          }
};     
window.addEventListener("command", getCommand, true);


/* Открывать загрузки в табе или переместить вкладку загрузок рядом с текущей вкладкой 
   если загрузи уже открыты и закрыть все лишние вкладки загрузок .......................................................................................*/
function downloadManagerInTab( foregroundTab ) {     
  
     setTimeout(function() { closeDownloadManager() }, 0); // закрыть стандартный менеджер загрузок
     
     var downTabUrl = 'chrome://mozapps/content/downloads/downloads.xul';
     var moveTab = false;

     // переместить вкладку загрузок в текущую группу вкладок и переместить вкладку загрузок рядом с текущей вкладкой ....
     for ( var i = 0; i < gBrowser.tabs.length; i++) {
           var tab = gBrowser.mTabs[i]; 
           if ( tab.linkedBrowser.currentURI.spec == downTabUrl ) {
                if ( TabView._window.GroupItems.groupItems.length > 1 ) {               
                     TabView.moveTabTo(tab, (TabView._window.GroupItems._activeGroupItem.id) );
                     }
                var selIndex = gBrowser.mCurrentTab._tPos;
                gBrowser.moveTabTo(tab, (tab._tPos > selIndex)? selIndex + 1: selIndex );
                var moveTab = tab.linkedPanel;                             
                break;                
                }
           }          
      
     // закрыть все лишние вкладки загрузок ....
     (function () { 
          for ( var i = 0; i < gBrowser.tabs.length; i++) {
                var tab = gBrowser.mTabs[i];
                if ( tab.linkedBrowser.currentURI.spec !== downTabUrl || tab.linkedPanel == moveTab ) continue;
                     gBrowser.removeTab(tab);
                     arguments.callee();
                 }
     })();
                    
     // открыть вкладку загрузок рядом с текущей вкладкой ....
     if ( !moveTab ) gBrowser.moveTabTo( gBrowser.addTab( downTabUrl ), gBrowser.mCurrentTab._tPos +1);
     
     if ( foregroundTab == true ) { gBrowser.mTabContainer.advanceSelectedTab(+1, true) };
};


// Автоматически меняем иконку для таба "Загрузки" ..........................................................
gBrowser.tabContainer.addEventListener("TabAttrModified", function(e) { 
     if ( e.target.linkedBrowser.currentURI.spec == 'chrome://mozapps/content/downloads/downloads.xul' )  {
          var tabIndex = gBrowser.getBrowserIndexForDocument( e.target.linkedBrowser.contentDocument);
          var tab = gBrowser.mTabContainer.childNodes[tabIndex];
          tab.image = ( tab.label == "Загрузки" )? falseDownloadsImg: trueDownloadsImg;
          }      
}, true);


// Исправляем ошибки ............................................................................................
function setFakeArguments(e) {
     if ( e.target.location.href !== 'chrome://mozapps/content/downloads/downloads.xul' ) return;
     var win = e.target.defaultView;
     win = win.wrappedJSObject || win;
     win.arguments = [];
};
gBrowser.addEventListener("DOMContentLoaded", setFakeArguments, true);
gBrowser.addEventListener("TabClose", setFakeArguments, true);



// Закрыть стандартный менеджер загрузок ..........................................................................
function closeDownloadManager() {
     var wm = Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
     var dm = wm.getMostRecentWindow("Download:Manager");
     if ( dm ) dm.close();  
};
 


// Блокировать повторный запуск обработчиков при открытии настройки панелей ........................................
this.onDestroy = function() {
    window.removeEventListener("command", getCommand, true);
    gBrowser.removeEventListener("DOMContentLoaded", setFakeArguments, true);
    gBrowser.removeEventListener("TabClose", setFakeArguments, true);
    observerService.removeObserver(myDownloadObserver, "dl-start", false);
};

var dm = Components.classes["@mozilla.org/download-manager;1"].getService(Components.interfaces.nsIDownloadManager);
var os = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);

var topics = ["dl-start", "dl-done", "dl-cancel", "dl-failed"];

// in console
function test() {
    var time = new Date().toLocaleString();
    LOG(time + " количество активных загрузок = " + dm.activeDownloadCount);
}

topics.forEach(function(topic) {
    os.addObserver(test, topic, false);
});

this.onDestroy = function() {
    topics.forEach(function(topic) {
        os.removeObserver(test, topic, false);
    });
}