Examine source code of Auto Mute Sites

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/auto-mute-sites",
  "browser_action": {
    "default_area": "navbar"
  },
  "background": {
    "scripts": [
      "storage.js",
      "background.js"
    ]
  },
  "icons": {
    "474": "icon.png"
  },
  "manifest_version": 2,
  "name": "Auto Mute Sites",
  "options_ui": {
    "page": "options.html"
  },
  "description": "Set the inital audible state of a site",
  "permissions": [
    "storage",
    "tabs"
  ],
  "version": "1.2.7",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8196eeac-351f-416c-95cf-bbdd1569da21}"
    }
  }
}