it works for me.

But before 3 weeks this stopped, and I have to log in everytime!

What did you do 3 weeks ago? Have you installed any extensions?
And which extensions do you have installed on your firefox?

It works for me both on Internet explorer and on Firefox. Maybe you should reinstall the whole browser?

But how to save the favourites?

Open Windows Explorer, Goto Directory:
C:\Documents and Settings\yourusername\Application_Data\ Mozilla\Firefox\Profiles\weirdrandomstuff
and copy the file bookmarks.html to somewhere else.

But I have the problem still, I uninstalled firefox installed it new, and nothing happened, I logged onetime in, made restart, went on www.unrealsoftware.de , but the Browser didn`t log me in!

Did you deleted your profile? If you uninstall Firefox, your Profile remains on the disk (it isn't known widely, since FF doesn't have a profile manager like SeaMonkey or old Mozilla).
Best is to simply delete your profile (it's the directory containing the bookmarks file), then restart firefox, close Firefox again and copy your bookmarks file back to the new generated profile directory, then start it again.
This should work.