Examine source code of 7TV BETA

{
  "manifest_version": 2,
  "name": "7TV BETA",
  "version": "3.0.0.19200",
  "version_name": "3.0.0.19200 beta",
  "description": "The Official 7TV Web Extension",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "./icon/beta-icon-512.png",
    "48": "./icon/beta-icon-512.png",
    "128": "./icon/beta-icon-512.png"
  },
  "permissions": [
    "scripting",
    "storage",
    "*://*.twitch.tv/*"
  ],
  "optional_permissions": [
    "management",
    "*://*.youtube.com/*",
    "*://*.7tv.app/*",
    "*://*.7tv.io/*"
  ],
  "web_accessible_resources": [
    "site.js",
    "site.js.map",
    "content.js.map",
    "worker.js",
    "index.html",
    "assets/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7cc17731-b734-4c98-a154-51d2bf266ef4}"
    }
  }
}