@ Nikilet
Although unrelated, firefox is now on 3.6.15, so you should ensure it is up to date (or update your signature).

I MBAM and SAS are the free versions, then there shouldn’t be an issue as they are on-demand scanners. SAS will load a driver, if you elect to have it place an entry in the right click menu to scan files using right click menu. Otherwise I don’t think it will load a driver.

I don’t think you need a specific history killer application, why not have firefox clear your history when you close it.