Chrome and Firefox have been subjected to add-on malware called BetterSurf.
Everything suggests that this primarily surfaces on Windows, but this is an add-on. It might be applicable to Linux.
Possibly some Windows-specific exploit is necessary to get it to show up in the first place. However, if it is Javascript-based, I believe it is possible that hostile web pages might implant it even on Linux. (I am a newbie to Linux and security, so perhaps this malware cannot run on Linux, but until I know that for a fact, I am remaining wary.)
The following info is quoted from the linked source.
http://webapps.stackexchange.com/que...ion-is-malware
the BetterSurf Firefox extension, I am forced to make a new question about this extension.
Beware, it is malware. How it get's onto your machine is still a mystery.
If you do run it, this is what happens: It starts servers listening on 127.0.0.1:0 It steals private information from all local Internet browsers
But this is not the frightening part. There are several other things it does to your PC, including a TASK it schedules to run called AmiUpdXP, which you can find and delete from c:\windows\tasks\AmiUpdXp.job on windows 7.
Other things I have found: A folder is created in your appdata/local called SwvUpdater which is referenced by the Task to run Updater.exe - the frightening part, since it will be able to download and execute any future malware/virus/worm. Server data goes to: hamonetizer.com Update downloads from: hxxp://www.helpfuldownload.com/update.php (borked it so it doesn't create clickable link)
