Hello dcarroll2046. I am sorry to hear that you have problems with Firefox Quantum. Knowing that this might be of very little help let me suggest this: Have you checked out [https://support.mozilla.org/de/questions/1192233 similar questions] on this forum? One solution could be to try and start Firefox in Safe Mode to see if any add-ons cause the problems. Now there has been another release of Firefox by now. Firefox 58 has introduced another performance boost for most people. Maybe you can try to install this version of Firefox? '''Be aware that you can not downgrade from any versions 58 or higher'''. You will need to [https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles backup of your Firefox profile] before you update to Firefox 58 if you want to be able to go back! ''By the way, if you want to file a bug report do so at [https://bugzilla.mozilla.org/ bugzilla.mozilla.org]. There any specific bugs and performance issues can be adressed by the right people.'' Let us know if anything of this helps or if not you might want to tell a little bit more about your PC, the number of add-ons and so on. Have a nice day and good luck.