Typing in Tor Browser opens an advertising tab

Question

I have the Tor Browser Bundle on Linux. When I start to type in a text box in the browser I often get shifted immediately to a new tab with some advertising. It doesn't happen every time, and in particular if I kill the advertising tab and go back to the original tab, I can type without hindrance.

Any idea whats causing this?

Answer 1

Did you check that you have a legitimate version of Tor? (Using the Checksums provided etc) Sounds like either your browser was compromised or you installed a faulty add on.