This addon mutes any Twitch stream while it plays an ad.
npm install webextension-polyfill
npx web-ext build --overwrite-dest
- Load as temporary extension in Firefox: https://extensionworkshop.com/documentation/develop/temporary-installation-in-firefox/
If you come across any bugs, please create a GitHub Issue with as much detailed information as possible. I will try to get to it when I can.