Hey there! Thank you for giving a review and using my addon.

Persisting the pins functionality really looks like an exciting feature to add to this extension. And I think, that I should really implement this now.

But for your issue of 'page going to back to beginning on refresh', I cannot replicate this on my latest Firefox on android. On refreshing, the page always seems to scroll back to the last position before refresh. I've again verified this by closing the app and restarting it.

Maybe unchecking the "cache" entry in "delete browsing data on quit" setting on android would somehow help.

If you need more help or have recommendation, you can create an issue on this extension's GitHub homepage.