One thing I really like about this new Firefox, is that the input lag for typing is really low. It's noticeably lower than Edge's. I think I might just make Firefox my default browser and test it out for a week or so.
The only issues I've had so far with it are that the Google translator didn't work, but that was easily rectified by using another translator. Also, the memory usage is much higher than Chrome's or Edge's, but I have 32GB of RAM in my machine, and I don't have a problem with high RAM usage as long as the browser is actually using it to improve performance and or security.
Right now it's using 1GB with 4 tabs open. I think I am going to open a lot of websites in other tabs and see just how far I can push it. I will report back!
*edit* OK with 20 tabs open, Firefox is using a little over 2GB. So it seems it uses a lot of RAM up until a certain point, then starts to actively reduce memory usage the more tabs you have open.
No problem with that!

Firefox is my new default browser.