After I have finished using Fire Fox and log off, and I come back later, I find that Fire Fox is open to a URL that I have not typed in or even searched on. I live alone, so no one else uses my computer, here is a example URL that was open this evening when I returned home from work: http://tv.channel157news.com/news/?ilmernzkvtazn=4
Do you believe in poltergeists ?
One possibility is that it is malware. I suppose a possible explanation is that you have some timer set to record TV programs. The link you give does not give me any credible results on a websearch which seems odd if it is a news tv channel.
I think scanning for malware using multiple up to date tools would be a good idea.
Usual suggestions being: Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
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It may be a good idea to ensure the computer is not connected phisically; including by WiFi; when left unattended, or you may get a surprise Internet of Phone bill.
I suggest putting your computer in sleep mode while you're away, if you don't need it to do be doing anything. Save a little electricity and minimize the possibility that it will surf the web on its own.
I use google chrome but i have the same problem.
This is one of the sites that pop up. It says "Sponsorship" in the interleaf.
I checked my computer with Malwarebytes Anti-Malware, but it didnt find any malware...
It is no good. You computer might be hacked by Black Hats. Black hats are illegal hackers. If it is really. Then you need to perform restore factory settings. If the problem continues then there is nothing you can do about it.
Hi heldor, you may need to try multiple scanners. Don't give up yet.
Edit: In case you did not see it, John99 posted a lengthy list.
Hi heldor, the principle of checking whether you have an unwanted extension applies to Chrome as well. This article shows where you can find them in the menu: Uninstall extensions - Chrome Help.
John99 said : Do you believe in poltergeists ?
yeeeesssss, i like that, life without humor is dead life .
It may also be worth noting that Firefox has a reset feature, that does not reset the rest of your computer just Firefox. It does however loose some information notably open tabs and Firefox extensions so you may wish to close open tabs or at least bookmark them and also bookmark the home websiets of any Firefox extensions