It's not a problem caused by Sajha or Firefox. Some how you got junk in the trunk of your computer and you got to Google the problem to find out if there is some kind of solution. Here is one of the solutions I have found in the Internet:

http://ask-leo.com/how_do_i_turn_off_those_ads_that_look_like_links_on_your_site.html

Try it. May be "Leo" actually knows and the solution works for you.

GoodLuck