Get Browser Version From Firefox Extension

5
votes

I have written a Firefox extension and am currently in the process of updating it for Firefox 4 and adding some new features.

Firefox 4 has a great new notification display that I'd quite like to use and have found plenty of documentation on how to use it. However, for anything less than 4 I have created my own notification window with specific styles.

My question is: how can I detect whether I'm using Firefox 4 or not in the javascript for my extension. Or, is there a better way of doing this?

2
javascriptfirefoxfirefox-addonxul
If you're referring to PopupNotifications.jsm then you can just look for the window.PopupNotifications variable and if it exists then you can use it otherwise you can use your own notification window. – Neil

2 Answers

10
votes

You can use nsIXULAppInfo:

var appInfo = Components.classes["@mozilla.org/xre/app-info;1"]
                    .getService(Components.interfaces.nsIXULAppInfo);
// appInfo.version contains the version

You can compare versions with nsIVersionComparator.

Maybe there is a better way, but this definitely works for me.