Not sure, but you should seriously consider investing in a surge protector, or invest in the time of turning of the computer during a thunderstorm because everybody knows you can potentially lose all of your data if a lightning bolt surges your power grid.
Anyway, isn't there a bookmark backup file somewhere? I'm pretty sure there is one.
Use a portable firefox and keep it in a USB pen or something. Don't think there is a way to recover your bookmarks but u can always try some undelete/recover software.
About the aspect of firefox there are hundreds of themes/skins in the firefox website for people to use