Examine source code of ReadmeUp

{
  "manifest_version": 2,
  "name": "ReadmeUp",
  "version": "1.1.0",
  "description": "Surfaces README files at the top of repository pages",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "https://github.com/*",
    "https://api.github.com/*",
    "https://gitlab.com/*",
    "https://api.gitlab.com/*",
    "https://bitbucket.org/*",
    "https://api.bitbucket.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*/*",
        "https://gitlab.com/*/*",
        "https://bitbucket.org/*/*"
      ],
      "js": [
        "src/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "src/background/service-worker.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_popup": "src/popup/popup.html",
    "default_title": "ReadmeUp"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "readmeup@esgalha",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}