You can move file named places.sqlite from your old profile to the new one. It contains bookmarks and browsing history. Here's a knowledge base article about it: [[Recovering important data from an old profile]] If you don't care about saving your current bookmarks, you can skip creating new profile (Firefox does it by itself at first run anyway). I'd might suggest you to install addon https://addons.mozilla.org/en-US/firefox/addon/2410/|Xmarks Bookmark and Password Sync]. It is a free web service which synchronizes bookmarks and (optionally) passwords with central server, and then to other computers, if you installed it on more. You may treat is as a backup too.