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kotlinlang

Is there any kotlin wrapper around the browser API to build extensions?

There is no official wrappers.
But you can take a look to these articles by <@U0ANSGGVC> :
<https://medium.com/@Cypressious/your-first-firefox-web-extension-in-kotlin-348fc907915>
<https://medium.com/@Cypressious/your-second-firefox-extension-in-kotlin-bafd91d87c41>


Actually, there is. <https://github.com/cypressious/kotlin-webextensions-declarations>

Yes, I mean there is no _official_ ones, that why I reference your article :)
I'm also curious about Chrome extension declaration, could your generator be reused for chrome

It most certainly could be reused. the chrome declarations can be found here: <https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api> but many apis are the same except that the root object is called `chrome`, not `browser`. extensions that target both browsers can use a polyfill, something like <https://github.com/kee-org/browser-addon/blob/bad6039589ac2b0b9af5af7cf435008d316b5983/common/browser-polyfill.js>