It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?

Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode (don't forget to select Disable all add-ons when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and themes and this one for plugins.

If you need support for one of your add-ons, you'll have to contact its author.

If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

Um, what's an "add on?"  :-)

Meanwhile, did you look at that thing? It's almost funny even if irritating.

Thank you. You are my new best friend.

Add-ons are things like extra toolbars and media players. Check the Tools menu under Add-ons to find out what you've got. Some add-ons have integrated advertising.

The ad window -- a "pop-under" -- might be a feature of a site you visit regularly. I always get a pop-under ad when I do a search on Orbitz, for example.

There are add-ons designed to reduce advertisements...