umm anyone helps?

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

It is possible that security software restores files in the Firefox Profile Folder on a reboot.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

See also:

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

umm i don't know but why firefox 7 was ok when firefox 8 has this problem?

also I'm using BitDefender 2010

still have the problem

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I have tried creating a new profile but not work.

me too,I have tried this,but the new profile has same problem with the old one :( I'm using BitDefender 2010

still can not solve it. I am waiting for any fix from FF

I have the same issue and none of the suggested solutions here worked to resolve the issue. I have 3 add-ons and the issue occurs on all of them. Also as with others it only started with Firefox 8.

Also use BitDefender v10, and have tried uninstalling / re-installing both BitDefender and Firefox with no luck.

UPDATE: Upgraded to BitDefender v12 (you can do this for free if you have a valid license for v10) and it resolved the issue.

Same issue here. Also using BitDefender 2010. Nothing is working.

Umm, thank you. But I may need a stable fully fixed Firefox 9 for this problem. Or is there any hotfix from Mozilla?

Mozilla isn't going to "fix" something that is caused by an external application, whether it a security application or not. denikar said that his problem was fixed by upgrading to BitDefender v12, so the problem is probably with BitDefender v10.

no, there should be some problem with the Enable - Add - On when open Firefox. This new feature has just come out since Firefox 8. Firefox 7 did not have this and everything used to be OK.

I updated to Bitdefender 2012 and the problem is solved. Cost me though. Had to purchase a new license. Could not transfer my license from version 2010. That's not right Mozilla! Create a fix!

Quite many has this issue