I’m in the same boat. I got in the world of extension development last year, and oh my, what a crazy mess. Apart from browser compatibility, I was really hoping for some product to help out with the operational stuff.
Ooof!! It is an... interesting time right now in extensions land. The switch from MV2 to MV3 is a bit chaotic but hopefully tools like this (Bedframe) and tools like [Plasmo](https://github.com/PlasmoHQ/plasmo) start to inject some freshness in the space.
No one does at the moment. The deprecation is on hold, but Chrome has stated that they "will provide at least 6 months between a timeline announcement and any experiments deprecating MV2 features": https://developer.chrome.com/docs/extensions/migrating/mv2-s...