Hi Glad to hear that you want to give Firefox Quantum a try. I have been using it for a while now and I really like it. To start with, I recommend that you back up your Firefox profile. You can read how to do this [https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles here]. Firefox Quantum is currently at the Beta release stage. You can download it from [https://www.mozilla.org/en-US/firefox/beta/all/ here] in your language. Having done that, you can remove your current version of Firefox. This [https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer article] will help with that. Having installed Firefox Quantum Beta, you can then reinstall your profile to get back your bookmarks and passwords. The article link I included about profiles will help with that. I hope this helps, but if not, please come back here and we will do our best to assist. (Hope you like using Firefox Quantum!)