Examine source code of TwitchMoveBarToOld

{
  "manifest_version": 2,
  "name": "TwitchMoveBarToOld",
  "version": "1.0",
  "description": "Changes the twitch ui back to how it was.",
  "permissions": [
    "scripting"
  ],
  "host_permissions": [
    "*://www.twitch.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "twitchmovebar.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "spaladinsstudiosTWITCHADDON@outlook.com"
    }
  }
}