How do i stop websites from hijacking my firefox home page setting? this hijacker didn't even identify itself with a logo.

at least two times my firefox preference home page has been changed. bing did it the first time, and there have been others. this time it is an unknown location. the new home page has no logo, and i'm not sure who it is. i've got avg protection software, the purchased version, for protection, but now i'm not sure if we are secure. not even sure how this hijack occurred. when i shut the system down using sleep, the system said new software updates would be installed on startup for firefox. the next time i started up, there was this new home page. is there anyway to prevent this from happening in the first place. if i install new software and the home page is changed, i can correct that, but this change was out of the blue. i think it was associated with firefox, but i'm not really sure. haven't installed new software for ages.
can anyone help with prevention?

Please create a screenshot of your Firefox by following the guide mentioned at [[How do I create a screenshot of my problem?]].
Once you've done this, attach the saved screenshot file to your forum post by clicking the '''Browse...''' button below the ''Post your reply'' box. This will help me to visualize the problem.
Also, I am assuming you have not clicked any links saying something like 'Set this page as my homepage'? This may seem a stupid question, but you may have inadvertently done this by pressing Enter on a page.

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