hello, websites can specify if browsers should be able to save username/passwords (through the autocomplete="off" attribute in the login form in the html source code) - this is often the case when a higher level of security is presumably required by those sites.

you can either install an addon, use a bookmarklet or upgrade to current release versions of the browser to circumvent this restriction.

Usernames and passwords are not saved

Note that Firefox 24.7.0 esr has been released.

• https://www.mozilla.org/en-US/firefox/organizations/all.html

• https://www.mozilla.org/en-US/firefox/24.7.0/releasenotes/

Details like websites remembering you (log you in automatically) are stored in a cookie.

• Create a cookie 'allow' exception to keep such cookies, especially in case of secure websites and when cookies expire when Firefox is closed.
• Tools > Options > Privacy > "Use custom settings for history" > Cookies: Exceptions

If clearing cookies didn't help then it is possible that the cookies.sqlite file that stores the cookies got corrupted.

• Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookies files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.

• http://kb.mozillazine.org/Cookies
• https://support.mozilla.org/kb/Deleting+cookies