Examine source code of Owlbear Rodeo Tracker

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.3.0",
  "author": "Redweller (redweller@gmail.com)",
  "manifest_version": 2,
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "icons": {
    "16": "/images/combat16.png",
    "32": "/images/combat32.png",
    "48": "/images/combat48.png",
    "128": "/images/combat128.png"
  },
  "browser_action": {
    "default_popup": "/action/popup.html",
    "default_icon": {
      "16": "/images/combat16.png",
      "32": "/images/combat32.png",
      "48": "/images/combat48.png",
      "128": "/images/combat128.png"
    }
  },
  "background": {
    "scripts": [
      "/action/storage.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.owlbear.rodeo/*"
      ],
      "run_at": "document_end",
      "js": [
        "/action/contentscript.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "/injected/*.js",
    "/injected/*.css",
    "/action/help.html",
    "/audio/*.mp3"
  ]
}