For mobile use container syncing (even just ssyncing which domains go in which container) would make it sooo much easier to protect from tracking.

Firefox for Android is a notable improvement over Chrome, but the add-ons available for it, even simple ones like javascript toggle, are significantly worse. On desktop it retains state for each site, wheread on Android it is a global toggle for all websites.

This. Especially if you use hotkeys for opening container profiles. Since the FireFox UI doesn't allow for container profile reordering in the UI you have to rebuild your profiles in the correct order (because hotkeys are mapped to order of creation based on numeric value) and reselect the appropriate icon and color to match the profile you're used to. Right now containers are not a welcome citizen with regard to Sync. I really enjoy containers but they need to be front and center and a first class citizen in the profile with Sync.