Examine source code of netlify-browser-extension

{
  "manifest_version": 2,
  "name": "netlify-browser-extension",
  "description": "netlify-browser-extension",
  "version": "1.2.3resigned1",
  "icons": {
    "16": "logo16.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "short_name": "netlifyext",
  "default_locale": "en_US",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_title": "Control Panel Version Check"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd3e8d0d-2198-4b65-9162-a2e889ca19fd}"
    }
  }
}