Need to move your bookmarks to another pc? Maybe you got a new computer, or your wiping your HD (which has to be done at some point in life), whatever the reason Firefox makes it easy to save your bookmarks to a single file so you can move them around.
Most of what you will want to do with bookmarks will be done in the Bookmarks Manager. This can be accessed from Bookmarks > Manage Bookmarks….
Select File > Export, and select a place to save the file. That's it for the backup!
Now you'll be wanting to know how to import those bookmarks from that file again of course. This is still done from the Bookmarks Manager, so go to it, click File > Import. Now select From File, and click Next (There may be options there to import bookmarks from other browsers which can be handy too!). Now select the file that you exported your bookmarks to and open it. Your done!
Although Firefox's Bookmarks Manager is an improvement from IE's and makes the export/import process a breeze, there is one shortcoming that I hope they improve upon in an upcoming release; you can't select certain bookmarks or folders of bookmarks to export, you have to take the whole list.
yet.
Joop Zonnet