How to fix CSRF in Firefox 18?

When I tried to log into Gmail or Tumblr, or even register in some sites, I can't log in. Google said that "Your browser's cookie functionality is turned off. Please turn it on." I checked both browsers and their cookies are indeed on. I even cleared them step by step just as Google instructed me to do, but nothing worked. Then I tried to register in this site but it failed again, it said," Security token doesn't match, possible CSRF attack." I searched all the possible help and ways to fix it but nothing worked. Please help me fix this. Thanks a lot in advance.

Did you try to clear the Google cookies?
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Press and hold Shift and left-click the Reload button.
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (MAC)

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