Firefox won't load some websites

Firefox has been working good until now. It started acting weird after a pop up came up saying something like "Start Firefox in safe mode or Reset Firefox" I misread reset as restart and clicked that and now sites like Gmail, Kongregate, and Bing won't load. I uninstalled Firefox then reinstalled it, I restarted my computer, I did a system restore, and I used safe mode on my computer still nothing. What is wrong? How can I fix this?

The folder on the desktop is called "Old Firefox Data".
In what way started Firefox to act weird?
*http://kb.mozillazine.org/Browser_will_not_start_up
*http://kb.mozillazine.org/Error_loading_websites
Do a malware check with some malware scanning programs on the Windows computer.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of their databases before doing a scan.
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
You can also do a check for a rootkit infection with TDSSKiller.
*http://support.kaspersky.com/viruses/solutions?qid=208280684
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
Another possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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