EDIT: Apologies. Updated with a link to what gorhill REALLY said:
Manifest v2 uBO will not be automatically replaced by Manifest v3 uBOL[ight]. uBOL is too different from uBO for it to silently replace uBO – you will have to explicitly make a choice as to which extension should replace uBO according to your own prerogatives.
Ultimately whether uBOL is an acceptable alternative to uBO is up to you, it’s not a choice that will be made for you.
Will development of uBO continue? Yes, there are other browsers which are not deprecating Manifest v2, e.g. Firefox.
Welcome to Firefox to anyone who is switching. I use a fork for Firefox (Floorp) Becuase I like it’s features.
What does that do?
Mozilla telemetry disabled (you can do this on normal firefox)
Some themes
Sidebar extensions
More easily move titlebar (firefoxcss)
Thank you fellow Boob liker.