Examine source code of AniList Modifier

{
  "name": "AniList Modifier",
  "description": "Add scores to AniList activity feed",
  "version": "1.3.2",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://anilist.co/*"
      ],
      "js": [
        "injection.js",
        "templates/settings/main.js"
      ],
      "css": [],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png",
    "256": "icons/256.png",
    "512": "icons/512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "48": "icons/48.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "thegregormaclaine@gmail.com"
    }
  }
}