You probably picked up some Malware that is resetting your preference for a Homepage in Firefox either when Firefox is restarted or when Windows is booted up each day. The '''AskTbFWV5/3.9.1.14019''' string that was added to your UserAgent would be the first thing that I would suspect, but I would suspect something related to '''Ask''' would be the URL, not '''''bearshare.com'''''. Install, update, and run these programs in this order. <br /> '''''(Not all programs detect the same Malware.)''''' <br /> They are all free for personal use, but some have limited functionality in the "free mode" - but those are features you really don't need to find and remove the problem that you have.<br /> ''Note: If your Malware infection is bad enough and you are mis-directed to URL's other than what is posted, you may have to use a different PC to download these programs and use a USB stick to transfer them to the afflicted PC.'' Malwarebytes' Anti-Malware - [http://www.malwarebytes.org/mbam.php] <br /> SuperAntispyware - [http://www.superantispyware.com/] <br /> AdAware - [http://www.lavasoftusa.com/software/adaware/] <br /> Spybot Search & Destroy - [http://www.safer-networking.org/en/index.html] <br /> Windows Defender: Home Page - [http://www.microsoft.com/windows/products/winfamily/defender/default.mspx] If these don't find it or can't clear it, post in one of these forums for specialized malware removal help: <br /> [http://www.spywarewarrior.com/index.php] <br /> [http://forum.aumha.org/] <br /> [http://www.spywareinfoforum.com/] <br /> [http://bleepingcomputer.com]

/questions/762144
/questions/700250

See e.g. these forum threads about Bearshare:<br /> [/questions/762144] [/questions/700250]