No it will not be a Firefox problem. It will most likely be adware or malware on your computer, probably from visiting some dodgy site &/or you downloading bundled software.

It appears you did not follow the prompt to include full troubleshooting information when writing this question, possibly the additional listings of all your extensions may have included a clue.

Additionally do not download Firefox from sites such as File hippo use official sites and downloads

• e.g.http://www.mozilla.org/en-US/firefox/all/ (Downloads)
  Firefox is available in more than 70 languages thanks to the contributions of Mozilla community members from around the world.

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 Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

@John99

list of all my extensions:
- Adblock plus 2.3.2
- Adblock plus pop-up addon 0.9.1
- Element hiding helper for Adblock plus 1.2.3
- Https everywhere 3.3.2
- IDM CC 7.3.52
- Low quality flash 0.2
- private tab 0.1.3
- tab scope 1.4.1

I have these extensions for some time and never got this problem but disabling them didn't fix anything.

I always download or update firefox from it's official download link. Right now, I'm scanning my pc for any malware or etc and updating my java. will report the results. and thanks for the help.

After running an scan nothing changed.

BUT now it's a little confusing for me... when I enter "www.filehippo.com" it will redirect me to "findicons.com" and when I enter "filehippo.com" it will not. so it is solved i guess??!! Any way, thanks for the help.

Did you check your hosts file?

• http://kb.mozillazine.org/Error_loading_websites

Wow, clearing cache Solved the problem completely! No more redirecting.