This is caused by an AOL addon to firefox. Please do the following:

• Start firefox in "safe mode" by holding down the option key while opening firefox. This will temporarily disable the addon so that you can use firefox.

• Type "about:addons" in the location bar and click "extensions". From that list, click "remove" for any addons that say "AOL" or that you don't recognize.

• restart firefox (not in safe mode)

After, look in your computers Programs Folder, and do the same thing.

Actually solved by reading related info that told me I had an obsolete blocking message and needed to update my Flash Player Plugin. Thank you, without your original message, I never would have solved the problemGHeilweil said

Tried to update Firefox first with AOL for Mac version then thru Mozilla with 37.0.1 for iMac 27 with OSX 10.7.5 a box appeared in both cases in the top middle of Firefox with what looks like a text line with a checkbox underneath. This prevents any use of Firefox. Please help ????