Well, technically speaking cljs-devtools is not a Chrome extension. It is just a piece of javascript you include in your javascript project running on client si

Well, technically speaking cljs-devtools is not a Chrome extension. It is just a piece of javascript you include in your javascript project running on client side in the browser. I don't follow development of Chrome or Firefox extensions to really tell, but I think writing extension in some transpile-to-javascript language should be transparent to us users. It might be even not advertised. I think developing extensions is not difficult, the difficult part is developing extension for multiple browsers. Not javascript, but the browser APIs differ. I follow just development of Blink/Chrome DevTools. One notable recent development is an attempt of TypeScript community to extend DevTools to support transpile-to-javascript language extension points: https://codereview.chromium.org/1264133002 https://codereview.chromium.org/1264133002. See the video here: http://ham.io/files/dt.mp4 http://ham.io/files/dt.mp4 This would help cljs-devtools to offer better development experience for ClojureScript as well.