[KobaQ]

E.g. here:

http://board.jdownloader.org/showthread.php?t=44832&page=16

It seems to occur only using the web-installer, which is the one you're offically prompted at by the creators of JDownloader.

Well, I removed JDownloader and manually fixed the start page and search engines of firefox to remove the sweet-page stuff, but somehow my firefox is still screwed.

Questionable decision by the maker of JDownloader. I can't imagine that the money he gets for this is worth the damaged reputation.

Edit: I just ran an adware scanner. Besides the Sweet Page stuff, WindowsManagerProtect and Hold Page was installed. Several Registry Entries and Firefox setting were infected. Unbelievable ...