Fluxa, you can bookmark all open tabs in the current window by pressing ctrl+shift+D. However, this would need to be repeated for each window separately. There may also be add-ons that could bookmark all tabs from all windows? As for Youtube, have you tried some of the standard troubleshooting steps such as clearing cache, cookies, or testing in Troubleshoot Mode or a new profile? For more information on these steps, see: https://support.mozilla.org/en-US/kb/how-clear-firefox-cache https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles