I downloaded the youtube.downloader file under the demonoid bit torrent disguise. Firefox was is my default browser. Even after uninstalling the downloader, the btsearch, avg.name kept coming up as my homepage. Antivirus and Malware will not detect this. I started up in safe mode, uninstalled firefox, and used IE as to download firefox again. Problem still existed. I uninstalled again, then did a file search of "Mozilla" on my hard drive. I came across a Mozilla Firefoxoverride config file. I deleted this file reloaded firefox and works fine. All the other support sites take you through the registries, downloading software, etc... blah blah blah. I just wanted to put this out there to help anyone else coming across this annoying problem. This may not fix your issue, but it is a possibility to try.
What home page do you use?
If there is a problem with searching via the default about:home page then try to reset the search engine used on the about:home page.
Reset the browser.startup.homepage_override.mstone pref via the right-click context menu to the default on the about:config page and close and restart Firefox to restore the about:home page to its default.
If this didn't help then delete the delete the chromeappsstore.sqlite file in the Firefox Profile Folder and repeat the above.
Try to reset some preferences to the default with the SearchReset extension:
Note that the SearchReset extension only runs once and then uninstalls automatically, so it won't show on the "Firefox > Add-ons" page (about:addons).
This really was not a question, but a solution and had nothing to do with the search engine.
I posted it here, because no other site had the solution to the problem. I use yahoo as my homepage. I could reset it in the options section, but when you close firefox, it would automatically revert back to avg.name. When you opened the options, it would be listed as avg.name as your homepage. I tried solutions on other sites, but nothing worked. I un-installed firefox, then did a a search of Mozilla to see what files were still remaining that could keep redirecting my homepage automatically back to the avg.name. That was when I came across the override config file as stated above. If you do a search of this problem, you will see that no one has a clear solution and it has not been addressed here. I just wanted to give a solution. Attached is a screen shot of the file in my recycle bin.
so I have this problem but I use internet explorer AND am operating in windows 8 right now. ive pretty much figured the system out, but it does have its qwerks. I would try everything you said @rpmjack, but clearly override firefox isn't my option. I suppose I can look for internetexplorer but we shall see.
okay, so I went into computer and just searched the term override and found the avg.override file. when I attempted to delete that file it kept interrupting saying an unexpected error was keeping me from deleting the file.. I went into task manager made sure all programs under youtube download was ended and after trying again several times, I had to just skip. ultimately, it worked!! I restarted my computer just to make sure, and all it well.
Note: there is one tine snippet of a file left in my computer associated with the avg. file, but it doesn't appear to affect anything. im not exactly a professional to remove it.
I wonder why after so many months... (I saw that people wrote about btsearch more that 6 months ago)... there is no proper solution to this issue...
all the "solutions" found on the web do not help
I am having exactly the same problem!! Nothing works, and for that reason I have switched to Chrome until someone at Mozilla takes this seriously!!!