Firefox: Backup Your Bookmarks
Backup your bookmark for safe keeping.
3 easy steps to do it.
But before making a backup of your bookmarks, might as well delete deadlinks and duplicates using AM-DeadLink. - optional
Now lets proceed…
STEP 1: Go to your toolbars and click Bookmarks. Then click Manage Bookmarks.
STEP 2: When the bookmark manager pops-up, go to File and click Export
STEP 3: Save a copy of your bookmark preferably somewhere safe like your thumb drive or floppy.
Tip: You can save a copy of your bookmark on the web by synchronizing it using Foxmarks.
Happy browsing! 
