If there were no updates or if the problem didn't go away after the update, you can individually disable extensions. You won't lose any settings when you disable extensions, and you can re-enable them later.
Click the Tools menu and then select Add-ons. The Add-ons dialog appears.
Click the Extensions panel. The list of installed extensions is displayed.
Click the name of the extension you wish to disable.
To disable the selected extension, click Disable.
From the menu at the top of the Firefox windowbar, select FileFirefox and then select the ExitQuit FirefoxQuit menu item.
Restart Firefox. Now that the extension you chose has been disabled, your problem may be gone.
If the problem persists, you should repeat the above process with each extension.
When your problem goes away, the extension that you most recently disabled is the source of the issue. You can then re-enable all the other extensions. You can also look for help from the extension's author by asking him a question on addons.mozilla.org.