Examine source code of BajsExtension

{
  "name": "Bajsextension",
  "description": "Automatically adjusts the aspect ratio of certain twitch streams.",
  "version": "0.1.6",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "https://*.bajsstuff.xyz/*",
    "*://*.twitch.tv/*"
  ],
  "background": {
    "scripts": [
      "permStorage.js",
      "userActivated.js",
      "common.js",
      "scenes.js",
      "bajsBackground.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "all_frames": true,
      "js": [
        "permStorage.js",
        "userActivated.js",
        "common.js",
        "scenes.js",
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "24": "movie-regular-24.png",
    "48": "forsenE.jpg"
  },
  "browser_action": {
    "default_popup": "popup.html"
  }
}