I was updated to 3.6 and now I cannot create new tabs. Neither the plus sign or cntl + T will open a new tab. If I right click and choose "open in a new tab", however, the tab opens just fine.
I've tried restarting the system, but decided not to uninstall/reinstall firefox, just in case I lost all my bookmarks and favorites. The restart did not solve anything. Also, I have colorful tabs add on and it was updated today. I disabled it, but that did not help either.
Uninstall the Ask toolbar and it should work again. There is a compatibility issue with the Ask toolbar and Firefox that prevents new tabs from being opened.
There are a couple of places to check for the Ask toolbar:
- Check the Windows Control panel for the Ask Toolbar - http://about.ask.com/apn/toolbar/docs/default/faq/en/ff/index.html#na4
- Also check your list of extensions, you may be able to uninstall it from there - https://support.mozilla.com/kb/Uninstalling+add-ons