What is the best Firefox sync service to replace Siphon?

April 30, 2014 at 06:47AM:

For many years, I have been using the Firefox add-on Siphon to synchronise add-ons across Firefox browsers and versions. Recently Siphon has stopped working (the rumour is, its due to the programmer’s death) and I am looking for an alternative add-on, but I am not given to trusting the generic Firefox sync service.

Does anyone have any recommendations?

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