the most annoying addon that i have seen so far Rated 2 out of 5 stars

every time i open firefox the addon opens a new tab asking for donation. very, very annoying. uninstalling it right now.

Opening this page every time you launch the browser - This behavior may be due to the fact that Firefox can not save preferences.
To solve the problem, try this:
http://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
http://kb.mozillazine.org/Preferences_not_saved