Firefox makes re-installs so easy
There are very few instances I can think of where re-installing you entire operating system can be a fun painless process. No matter what it seems you always miss something and lose some data. It seems like Firefox developers had the same gripe and did something about it.![]()
In order backup/save/move all Firefox settings such as bookmarks, extensions, saved passwords - everything that makes using Firefox a good experience - you only need to pay attention to 1 folder. On windows this folder is located in “documents and settings/your username/application data/Mozilla”. For details follow this link on “How To Manage Profiles“.

December 12th, 2007 at 4:08 pm
I’ve also used this method to share my profile between operating systems. My laptop dual-boots Windows XP and Ubuntu 7.10 and I have a small partition that I keep my Mozilla Firefox and Thunderbird profiles on. The Profile Manager needs to be configured in separately in each operating system.
This saves me a lot of grief and keeps me connected to my email and browser bookmarks.