User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0

Steps to reproduce:

I'm testing the uBlacklist extension on Fenix and noticed that the API browser.permissions.request seems to do nothing - no dialogs, no errors in the console.

Steps to reproduce:

1. git clone https://github.com/iorate/uBlacklist
2. npm install && npm run build:firefox:development
3. Install the extension in dist/firefox/development with web-ext
4. Open the option page of this addon using the step listed in [1]
5. Hit the "Add subscription" button
6. Enter a random name and some URL and hit "Add"

Environment: Android 9.0, Fenix nightly 200924 06:03

[1] https://discourse.mozilla.org/t/debugging-an-addon-in-fenix-nightly/68011/2

Actual results:

Nothing happened

Expected results:

A dialog asking for additional permissions like the attached image. It is the case for Fennec 68.11

Yeah it's not implemented yet.