hello, you may have malware on your pc. please go to firefox > addons > extensions & remove any suspicious entries (in particular Browse2save 3.8, things that you have not installed intentionally, don't know what purpose they serve, etc). also go to the windows control panel / programs and remove all toolbars or potentially unwanted software from there and run a full scan of your system with the security software that you have in place and different other tools like the free version of malwarebytes & adwcleaner.

Remove a toolbar that has taken over your Firefox search or home page Troubleshoot Firefox issues caused by malware

Hello philipp,

Thank you for trying to help but it seems like the problem still exists. scanned for malwares and uninstalled the toolbars and the Browse2save extension but still the same. Any other solution please ? this problem is so annoying :(

can you access google, when you type 173.194.35.49 into the address bar?

oh yes, when I type 173.194.35.49 it directly takes me to google.

Edited: ps: I can't access it when I type "google.com"

ok, the symptoms look like the malware has overwritten your hosts-file (in order to redirect you to malicious website when you type in google.com, twitter.com or other common domain names) - please try the microsoft fixit from http://support.microsoft.com/kb/972034 in order to tackle the issue.

Problem solved by resetting the host file. Thanks a lot mozilla support team.

you're welcome :))