If you have not closed Firefox, open the bookmarks library (in the Bookmarks menu select Organize Bookmarks), then in the library select Organize > Undo.

If you have already closed Firefox, or the Undo option is not available, you can restore one of the automatic bookmark backups (Firefox creates backups of the bookmarks for the last 5 days that it was used). For details of how to do that see the "restoring from backups" section of the Restore bookmarks from backup or move them to another computer article.

Thanks TonyE,

You saved me alot of time and effort trying to find on the web all the urls I wanted to keep.

Two thumbs up for Tony !!

There are other things that need attention:

Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

• Shockwave Flash 10.0 r45

Update the Flash plugin to the latest version.

• http://www.adobe.com/software/flash/about/

Hey thanks cor-el for reminding me to update.