Examine source code of DGG Injector

{
  "manifest_version": 2,
  "name": "DGG Injector",
  "version": "0.1",
  "icons": {
    "128": "icon.png"
  },
  "description": "NOTE: must be reactivated each time and old twitch chat will fail to load until you refresh the page. PepeLaugh, my friends.",
  "browser_action": {
    "default_icon": {
      "128": "icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}