✔ 最佳答案
firefox user profile (including bookmarks) are stored under
C:\Documents and Settings\(your username)\Application Data\Mozilla\Firefox\Profiles\(some random string).default\
and is preserved when you uninstall firefox
it is therefore safe to have your damaged version of firefox uninstalled and reinstalled, without the risk of losing your bookmarks
if you, however, suspect that the problem is caused by one of the extensions installed, then you can backup the bookmark file named
-->bookmarks.html<--
also under the profile folder
you should then manually delete the profile before reinstalling firefox
and after installation, copy that bookmarks.html back into the newly created profile folder.