Thank you for the thoughtful and kind words! I really appreciate you taking the time to write this up.

Regarding the pinned status, unfortunately Firefox does not expose any APIs for extensions to use to edit tags and keywords—there's no way for me to store metadata along with a bookmark outside its URL and title. I wish there were because there is a lot more that could be done, but this is unfortunately not an option.

Regarding tab groups, I agree with you—it's a feature I'm actively working on but isn't ready yet. Unfortunately, it's taking me quite a long time due to life getting in the way, and due to the fact that it is a major change to how Tab Stash works internally and how it communicates with Firefox. I also want to make sure I get the feature right and that it doesn't feel bolted-on to how the extension works. So it may take a while longer yet, but it'll happen eventually!

And again, thanks for the kind words, they mean a lot! I'm happy to hear Tab Stash is working well for you. And of course, feel free to reach out on GitHub if anything ever comes up.