I have loads of extensions in firefox. Last night i got a few new one but I didn't like them so i clicked uninstall. It say's now that they wil be uninstalled after firefox is restarted so i shut it down, al of the windows. But its stil there. Even when i reïstalled ff and restarted my computer. Now the question: How can i fix this. I am willing to delete whole firefox but i have a lot of bookmakrs that i don't want to lose. Is there a way to save them?

The extension Bookmark Backup could help you
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But I'd try starting FF in safemode first. It opens a "naked" FF without the extensions activated and so it might help you find the problem.

I have made a back-up and uninstalled firefox and the whole map in program files. But when I install it again everything is there including the extensions that i wanted out. THer stil saying the same. Starting up in safe mode didn't help.

make sure you delete the firefox profile, then uninstall + reinstall

What profile? Where do you do that?

I you have xp the profile can be foun here:

Drive:\Documents and Settings\username\Mozilla\Firefox\Profiles\xxxxxxxx.default\
(Drive = system drive) (xxxxxxxx = 8 random characters)

Just put everything in that directory in a zip file and you're good to go.