Hey guys,
while cleaning my %temp%-directory I found a folder called AVASTBCLTMP.
In this folder was another subfolder named chrome. The only file inside that folder was Web Data.
In this file were many urls and links I had clicked on the past days, e-mail adresses I use and also nicknames for forums.
I couldn't find any of my passwords, which let me relax a bit, but I mean, wtf is that?
I am using AVAST for years now, I resetted my PC a few days ago and updated the Avast-Software recently. This never happened to me.