Now, WeatherFox has stopped working. A message to reconfigure it has been appearing every time I boot up Firefox, and is getting quite annoying. Also, It has been erasing my bookmarks. I heard accounts of this from other people on GameFAQs, and now it is happening more frequently. I do not even bookmark pages now, as the bookmarks are erased within maybe 3 days. Before they lasted maybe 1-2 months without any problem.
Here is a screenshot of what I see on firefox, though its cropped:

As you can see, my bookmarks on the bookmark toolbar are gone (they actually just reset), my theme is back to normal, and the error is popping up.
I have enjoyed FireFox immensly in the past, but now I am starting to dislike it.
I tried to reinstall from the setup file I have saved on my computer, but that just made another icon on my desktop. Would I need to download another setup file and try to install it from that?
I really want to use FireFox, I get WAAAY too many popups with IE, to go from none to a billion would be impossible.
Thanks, any help is appreciated.
(EDIT) I forgot to say what the annoying thing about that popup was. The 'OK' button does not work, I can hit it and it doesn't confirm. I have filled out the form multiple times, and no dice. Maybe it is because of the recent change to ForecastFox, but with my Extensions menu not working I can't uninstall it or put in the new one.

