_ff-addon-snippet-FindAddonMgr - Finds the addon manager and returns an object holding its windows.

_ff-addon-snippet-FindAddonMgr.js

function findAddonMgr() {
	//future: i plan to allow argument to this function so it searches just the CURRENT firefox window for addon manager, but for right now its global
	//searches for addon manager tab in ALL FIREFOX WINDOWS and when found it returns the an object holding browser window (domWindow) and contentWindow (the window is the equivlent of gBrowser.contentWindow from scratchpad)
	var windows = wm.getEnumerator('navigator:browser'); //gets all windows with gBrowser
	while (windows.hasMoreElements()) {
		var domWindow = windows.getNext();
		if (domWindow.gBrowser) {
			if (domWindow.gBrowser.tabContainer) {
				var browsers = domWindow.gBrowser.tabContainer.tabbrowser.browsers; //each tab is a browser
				for (var i=0; i<browsers.length; i++) {
					var loc = browsers[i].contentWindow.location;
					//console.log('in this window tab ' + i + ' is at location of "' + loc + '"');
					if (loc == 'about:addons') {
						return {
							domWindow: domWindow,
							gBrowser: domWindow.gBrowser,
							contentWindow: browsers[i].contentWindow
						};
					}
				}
			} else {
				//no tab container
				var loc = domWindow.gBrowser.contentWindow.location;
				//console.log('no tab container in this window so just one gBrowser element. the location of this is "' + loc + '"');
				if (loc == 'about:addons') {
					return {
						domWindow: domWindow,
						gBrowser: domWindow.gBrowser,
						contentWindow: domWindow.gBrowser.contentWindow
					};
				}
			}
		} else {
			//window does not have gBrowser
			//its unlikely, like 99.9% that about:addons is opened in a non-gBrowser'ed window so I dont care for this
		}
	}
	
	return null;
}

var isManagerOpen = findAddonMgr();
if (!isManagerOpen) {
	//manager is not found so open it in the most recent browser window
	Services.wm.getMostRecentWindow('navigator:browser').BrowserOpenAddonsMgr();
}