Attached images explain..

Hi,

I'm sorry you are having this problem with Firefox, I did a bit of research and I think you have been infected with malicious software, unfortunately. Please follow the instructions for installing the malware checkers at the end of the following support article: Troubleshoot Firefox issues caused by malware

Also, here is a post from a top 10 contributor to our Firefox support forum with similar instructions for dealing with malware of this kind: https://support.mozilla.org/en-US/questions/769664#answer-123027

Regards, Michelle

You can also check the connection settings.

• Tools > Options > Advanced : Network : Connection > Settings
• https://support.mozilla.org/kb/Options+window+-+Advanced+panel

Did you make changes to network.http.* prefs?

• http://kb.mozillazine.org/about:config

"Clear the Cache":

• Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

• https://support.mozilla.org/kb/Clear+Recent+History