Examine source code of FrankerFaceZ

{
  "manifest_version": 3,
  "name": "FrankerFaceZ",
  "short_name": "FFZ",
  "version": "4.80.4.0",
  "description": "The Twitch enhancement suite. Get custom emotes and tons of new features you'll never want to go without.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "homepage_url": "http://www.frankerfacez.com",
  "action": {},
  "permissions": [
    "unlimitedStorage"
  ],
  "host_permissions": [
    "*://*.twitch.tv/*",
    "*://*.frankerfacez.com/*"
  ],
  "externally_connectable": {
    "matches": [
      "*://*.twitch.tv/*",
      "*://*.youtube.com/*"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "web/*"
      ],
      "matches": [
        "*://*.twitch.tv/*",
        "*://*.youtube.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "web/worker.js"
    ],
    "service_worker": "web/worker.js"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "web/script.min.js"
      ],
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "exclude_globs": [
        "*://api.twitch.tv/*",
        "*://localhost.rig.twitch.tv/*",
        "*://blog.twitch.tv/*",
        "*://im.twitch.tv/*",
        "*://chatdepot.twitch.tv/*",
        "*://tmi.twitch.tv/*",
        "*://brand.twitch.tv/*",
        "*://dev.twitch.tv/*",
        "*://gql.twitch.tv/*",
        "*://passport.twitch.tv/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "frankerfacez@frankerfacez.com"
    }
  }
}