Why are you still using that old version of Firefox? <br /> 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 <br /> or <br /> http://www.mozilla.com/en-US/firefox/all.html Unless something you have installed has your UserAgent "locked" to that old version. <br /> 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. <br /> https://support.mozilla.com/en-US/kb/Remembering%20passwords