Hello Bill.

You may be 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 coming from 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 and select Disable all add-ons. 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 theme. You can troubleshoot plugins the same way.

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

See: http://kb.mozillazine.org/Sorting_and_rearranging_bookmarks_-_Firefox Deleting bookmarks

If you can't remove bookmarks then also see: http://kb.mozillazine.org/Locked_or_damaged_places.sqlite

I am using Firefox 8.01 for mac. I was just able to delete unwanted bookmark by clicking "Bookmarks-->Show All Bookmarks" then another window popped up, then click on "Bookmarks Menu" in the left navigation to see a list of all your bookmarks on the right. Find the bookmark you want to delete, right-click on the bookmark name and click "Delete" from the popup menu. Its gone!

This was very helpful. Thanks