Examine source code of autochoosy

{
  "manifest_version": 2,
  "name": "autochoosy",
  "version": "1.0.1",
  "description": "Automatically open matching URLs with Choosy from in-browser",
  "homepage_url": "https://github.com/sjahu/autochoosy",
  "browser_specific_settings": {
    "gecko": {
      "id": "autochoosy@shumphries.ca"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "autochoosy.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ]
}