I opened Chrome this morning and discovered the red AdBlock icon near the omnibox wasn't there. I opened the Extension list and discovered two extensions I'd never seen before, and all the others deleted (Herpderp youtube, adblock, etc.)
In a panic I deleted the unrecognized ones that had (IMO) obvious malware names, but in my haste I dind't write them down or anything. (I guess I'm not that super of a user :( ) So, I'm not sure which they were, but I certainly didn't install them. If they appear again, I'll edit this post with their names.
How can extensions be installed without my permission or knowledge? And, how can I prevent that from happening?
EDIT: That was fast. These two have been installed: DOOwNSaave 5.2 and FindBeSStDeAl. Where can they come from?