I'm using Windows 7. Just uninstalled Google Chrome and installed firefox, but now I can't login.

After Login it seems I logged in already: enter image description here

but when it automatically directed to the math exchange page, I'm still not loggin yet.... enter image description here

what could I do?

  • $\begingroup$ Try clearing the cache of the browser. $\endgroup$ – user147263 Jan 21 '15 at 2:05
  • $\begingroup$ it's a newly installed Firefox. I went to Tools -> Options -> network -> Cached web content -> clear now, still not working. $\endgroup$ – user209379 Jan 21 '15 at 2:31

This happened to me lately. The following worked for me (Windows 7, Firefox 35.0):

Open menu -> Options -> Privacy

In the section "History" select "Use custom settings for history," then click on "Show Cookies..." Look for cookies of StackExchange sites (e.g. math.stackexchange.com) then remove them.

You might want to close Firefox and open it again. Try logging in. Does it work now?

  • $\begingroup$ it works like a charm :) $\endgroup$ – athos Jan 21 '15 at 10:33
  • $\begingroup$ You might want to accept this answer, then. :) $\endgroup$ – Joel Reyes Noche Jan 21 '15 at 11:07
  • $\begingroup$ I don't know how to login as anonymous now :( $\endgroup$ – athos Jan 21 '15 at 11:13
  • $\begingroup$ It's okay. I'm glad your problem is solved. :) $\endgroup$ – Joel Reyes Noche Jan 22 '15 at 8:18
  • $\begingroup$ Unfortunately, Stackexchange has intentionally changed its login procedure so that you now have to delete cookies every single time you log in. This is asking a bit too much, I think. $\endgroup$ – WillO Jul 11 '15 at 22:42

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