[lucumo]

Firefox's sync is broken in many ways. It doesn't sync search engines or extension settings either. It also frequently stops syncing from Android.

I rely on sync a lot, so that was a dealbreaker for me.

[cbsks]

Extension settings can be synced, but the extension must explicitly call the storage.sync api https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

[efreak]

Unless you're on Android. Android doesn't give extensions access to sync. When I update ublock manually (usually to make things go away on my phone, hence the need) I have to manually export it.