I use it, but when I experimented with data synchronization using Firefox Sync, it simply doesn’t work, it is so unreliable and unpredictable that you can’t bet on it. It’s a real pity, because I wanted to use it for a cool thing, synchronizing data of one website, without having my own server for that website. It failed because Firefox Sync fails.

I recommend KDE Connect, it also has this function. :)
But sometimes I use this and sometimes I use that feature.

My own:
https://media.kbin.social/media/f8/e2/f8e2feab51b120821cb1737a1d772b8771ffe0d9a3aa7207b041bf9e8efc9d37.png

Not only. This also happens when switching between TTYs.

I’m trying to move the setting to the boot stage, but it’s not easy.