@Siphonay
Now I just have to wait for SeaMonkey to catch up.

Regarding change in software: I tend to be sceptical because far too many times I've seen developers embrace change for the sake of change with no regard for how said change affects the users. Examples: systemd, Orbot.

I say if you're going to make major changes then

1. Think about how it will affect users
2. Come up with a plan and stick to it before & while writing code
3. Avoid feature creep by limiting the scope of change