On top of the language/toolkit restrictions, I'm not a huge fan of writing browser extensions simply because of the limitations they pose compared to just about anything else… server side app, static SPA, electron, and native desktop/mobile are all so much more capable that when ideas spring up, those are the platforms they tend toward.
I think though that if browser extensions broadly became capable of browser UI overhauls like Firefox extensions used to be, I'd be much much more interested. Most of the things I want to change about web browsing are in the browser, not the web, and making those changes by way of extension is far more practical than the nightmare of maintaining a browser fork.
I think though that if browser extensions broadly became capable of browser UI overhauls like Firefox extensions used to be, I'd be much much more interested. Most of the things I want to change about web browsing are in the browser, not the web, and making those changes by way of extension is far more practical than the nightmare of maintaining a browser fork.