Examine source code of MaiWaifu

{
  "name": "MaiWaifu",
  "version": "1.5.3",
  "applications": {
    "gecko": {
      "id": "maiwaifu@maiwaif.us"
    }
  },
  "description": "An extension for Twitch that shows you other MaiWaifu user's waifus and avatars.",
  "permissions": [
    "storage",
    "cookies",
    "https://maiwaif.us/"
  ],
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "images/32px_-_happy.png",
      "48": "images/48px_-_happy.png",
      "128": "images/128px_-_happy.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end",
      "js": [
        "contentScript.js"
      ],
      "exclude_globs": [
        "https://www.twitch.tv/directory/*",
        "https://www.twitch.tv/p/*",
        "https://www.twitch.tv/products/*",
        "https://www.twitch.tv/*/manager*",
        "https://www.twitch.tv/*/dashboard",
        "https://www.twitch.tv/broadcast",
        "https://www.twitch.tv/messages/*",
        "https://www.twitch.tv/settings"
      ]
    }
  ],
  "icons": {
    "32": "images/32px_-_happy.png",
    "48": "images/48px_-_happy.png",
    "128": "images/128px_-_happy.png"
  },
  "web_accessible_resources": [
    "images/*.png",
    "images/*.svg",
    "fonts/*"
  ],
  "manifest_version": 2
}