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I used to do this, but self-hosted. It was insanely useful.
Then FF changed too much between versions, and so did python, the whole thing stopped being possible, and because nobody uses FF anymore (the fools), maintenance / development of it stopped entirely.
Which doesn't answer your question , but I don't care, you're not my mum.
Any reason not to sync Firefox across devices?
https://support.mozilla.org/en-US/products/firefox/sync