Finally migrated back to Firefox today after a multi year user of Chrome.
What pushed me over the edge? Most of my app icons (keep, pulse, calender, whatsapp) stopped opening in their own windows again.
I had to install the PWA extension in Firefox to get that working again, and it's going to be a slight hassle having to copy and paste URLs from all those windows, but I'm tired of fixing the task bar icons.
Could've gone to Edge since it would work out of the box, but I like Firefox. (except for no native PWA support.)
Edit: found I can right click links in the PWA instances and use the send to other device option to open them in my main Firefox window.