Had this issue in Firefox, uninstalled it from my Mac and downloaded a new copy, same issue persisted. Moved to Firefox Nightly, same issue. I'll be working on something and then my tab will crash, showing the Mozilla "your tab has crashed" window. Any new tabs I open will display this as well, automatically crashing. Sometimes restoring them works, sometimes it doesn't. This will also crash tabs in other windows, as well as new tabs opened there. I've tried completely removing both apps and reinstalling them, but the issue persists. I have a video but this forum doesn't seem to have video uploads--would be happy to email Mozilla support to get this looked at if that would be helpful. I loved this browser, I'd like a solution so that I don't have to find another one! Any help appreciated.

Additionally there seem to be two copies of the app operating simultaneously, they both appear in my dock at the same time? Image attached.