how do i save username and passwords of bookmarked items?
How do I save username and passwords for bookmarked items
ప్రత్యుత్తరాలన్నీ (1)
Why are you still using that old version of Firefox?
3.5.19 is the latest of the Firefox 3.5 version, and that is about to be no longer supported by Mozilla.
http://www.mozilla.com/en-US/firefox/all-older.html
or
http://www.mozilla.com/en-US/firefox/all.html
Unless something you have installed has your UserAgent "locked" to that old version.
https://support.mozilla.com/en-US/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser
Saving a username & password for a bookmarked website is no different than for any website.
https://support.mozilla.com/en-US/kb/Remembering%20passwords