See:

• https://support.mozilla.org/questions/916830

also try on Firefox 11

• getfirefox.com

Is not it, not every time i update, it happens every timme i OPEN the firefox. If i close the firefox, and open again, it checks again, if close one time more, on open again, do it again... But thanks anyway, i am tired of the problem and make a "clean reinstall", removing and instaling again from zero, i lost all my saved passwords, but i am very tired of this annoy thing...

Which security software (firewall, anti-virus) do you have?

Some security software has virtualization features that can cause problems by protecting and restoring files in the Firefox profile folder.

It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

• https://support.mozilla.org/kb/Profiles

New files will be created when required.

See "Corrupt extension files":

• http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
• https://support.mozilla.org/kb/Unable+to+install+add-ons

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is a compatibility update available.

See also:

• http://kb.mozillazine.org/Preferences_not_saved
• https://support.mozilla.org/kb/Preferences+are+not+saved

Is not the antivirus, maybe anything with the extensions, but i am tired of this problem and make a "clean reinstal" i lost all my saved passwords, but is the life... (the historic and bookmarks i passed for the chrome, and got it back, but no way for back the passwords, from firestorm to chrome it do, but from chrome to firefox not. thanks anyway.