I had previously gone back to Firefox for Panorama (Tab Groups.) But, the feature has seemed to live in a state of such flux that I eventually found myself falling back on my habit of using Chrome.

Iirc, they decided to move it out of the browser and in to an add-on, which is frustrating in light of the recent changes. Don't get me wrong, I'm for the migration to WebExtensions, but it's annoying that there wasn't a better path for a feature that used to be a part of the browser.

Here's hoping most of this will be resolved in the upcoming months.