I created a page shot on one computer. Moved to another one. No trace of it in My Page Shots. (Yes, logged into both; yes, synced machines.) The page shot url works - but it doesn’t show up on all computers.
Currently, your shots are tied to your local Firefox Profile directory, and connecting all your shots made on different computers together by logging in to Firefox sync is not implemented. We had implemented it previously, but took it out to simplify the launch into Test Pilot. It would not be hard to add this feature back in since all the code is in place to do it, so hopefully it will get done soon. The only part that needs to be rewritten is the way the page shot add-on logs in to Firefox accounts.
Thanks. I definitely think you should add the sync back.