Some websites require to type in username and password to log in. When I do so, the page reloads, but doesn't sign me in; the username is filled in, the password box is empty. No error messages are shown. However, when I type the password second time, I log in fine.
I am using Mac OS 10.6.8 and don't have this problem in any other browser.
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Can you mention the websites you tried to to login.
This can be caused by corrupted cookies or cookies that are blocked (check the permissions on the about:permissions page).
Clear the cache and only cookies from websites that cause problems.
"Clear the Cache":
- Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
- Firefox > Preferences > Privacy > Cookies: "Show Cookies"
If clearing cookies doesn't work then it is possible that the cookies.sqlite file that stores the cookies is corrupted.
Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.