Yeah, so you either have malware, or something changed your homepage.

What you can try. (I'd advise to do these in order)

1. Reset your homepage to default.

• Press the ALT button on your keyboard in Firefox and then click Tools>Options.
• Go to "General" and click "Restore to default" under Startup.
• After that, close and reopen Firefox and see if the malware pop-up still appears.

2. Check for malware on your computer and malicious add-ons on Firefox.

• Press ALT on your keyboard and click Tools>Add-ons.
• Scan your list of add-ons for unfamiliar or suspicious ones, and click "Remove" or "Disable" next to them if you find them.

• Download Extension Defender (an add-on on the Mozilla add-ons page).
• Open it, and scan Firefox for malware, in case you missed some dangerous add-ons while looking on your add-ons page.

• Download Malwarebytes Anti-malware.
• Install it from the setup file you downloaded.
• Once installed, open the program, update the databases, then run a scan with it for malware on your computer. The program will remove malware for free. (Feel free to uninstall Malwarebytes once you're done using it)

3. Reset Firefox, which can solve a number of issues which you cannot fix with Firefox.

• Type about:support into your browser's address bar and press Enter on your keyboard.
• Click "Reset Firefox..." once you reach the page.

Note: this will reset your Firefox addons, preferences, etc.

I hope I can resolve your problem!

If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should never respond to such an alert to avoid getting infected with malware.

• Only update Firefox via "Help > About" or by downloading and installing Firefox from the Mozilla server and never via a pop-up or link on a web page.
• Plugins should only be updated via the plugin itself or by visiting the home page of the plugin.

Dear Friend Thank you for your suggestion. Your suggestion somehow solved the problem. I first reset Firefox and installed malware soft and scanned the computer. Now virus page not disturbing but when see movie it becomes slow. Would you please tell me how can I solve this problem? Thanks Sincerely Mamoon

Dear Friend Thank you for your suggestion. Your suggestion somehow solved the problem. I first reset Firefox and installed malware soft and scanned the computer. Now virus page not disturbing but when see movie it becomes slow. Would you please tell me how can I solve this problem? Thanks Sincerely Mamoon

A movie being slow? Has Firefox done that prior to the malware problem, and do other internet browsers (Internet Explorer, Google Chrome, etc) do that, too? It probably has to do with your internet connection speed. To confirm that it does, though, can you please go to Speedtest.net and record your internet speed, then post it here, please?