https://support.mozilla.org/en-US/kb/password-manager-remember-delete-change-passwords?redirectlocale=en-US&redirectslug=Remembering+passwords

That key icon is only there if you are on a web page with a log in form and you have entered data. ---- Make sure that you do not run Firefox in (permanent) Private Browsing mode. *https://support.mozilla.org/kb/Private+Browsing *Tools > Options > Privacy: Use custom settings for history *Deselect: [ ] "Always use private browsing mode" Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance). *Do NOT click the Reset button on the Safe mode start window or otherwise make changes. *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes