[tomrittervg]

There's a few children of this comment, noting this, but to tie things together from someone from Mozilla:

- You can self-host your own sync server. It's not something we spend a lot of time making easy, but it is possible and supported in some capacity: https://mozilla-services.readthedocs.io/en/latest/howtos/run...

- You can definitely build extensions for other browsers (or a standalone app) that implement the Sync protocol.

[Vinnl]

> - You can definitely build extensions for other browsers (or a standalone app) that implement the Sync protocol.

In fact, GNOME's web browser already did so: https://blogs.gnome.org/mcatanzaro/2017/08/09/on-firefox-syn...

[nerdponx]

Last I checked self-hosting a sync server was pretty much not feasible. Happy to see that's changing.