Some of us opened Firefox today to find that there was an update from .90 to .91.
Some of us updated it.
The update notification didn’t go away. There’s a big red box in the lower right corner of your browser telling you to update your browser. This is for two reasons. 1). The update notification is turned on. 2). The code is lying about being version .90 so as not to break your extensions.
You can fix this rather easily by following these steps:
1). Type “about:config” into the location bar
2). Type “update” in the filter dialog
3). Find “update.app.updatesAvailable”
4). Set the value from “true” to “false.”
5). Restart your browser
You may have to reset this for future updates of Firefox but, for the time being it will get rid of that huge red box shouting at you.
Click the icon for a screenshot for your viewing pleasure: