Ok. I now notice that it opens as a tabbed window even though I have tabs turned off. I do not remember seeing a tab at the top of the Add-ons window before. I have been trying different themes. Could a theme cause this?

James

Addons opens as as a tabbed window:

Firefox changed it to a tab, so that is the new normal. When you close the addons window you should be back to what you had before. You can't do some things when you are in the addons

You can make Firefox 6.0 look like Firefox 3.6.*, see numbered items 1-10 in the following topic Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 thru 6.0, look like 3.6). Whether or not you make changes, you should be aware of what has changed and what you have to do to use changed or missing features.

• http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Got it.

Seem ok now. I'l keep this mind mind if it happens again

James