STRONGLY recommended, especially with the 'local-first' approach mentioned in further comment by original author above. Y'all really need to stop thinking of Firefox as 'a web browser' anymore. We're WAY BEYOND that point in our workflows now. Ex...
I'm also having similar concerns. I rely on ThunderBird, yet since last update all sorts of freezes and problems and especially integration problems with my other devices and other calendars have suddenly popped up. WTH? I haven't been following a...