Examine source code of Opaque

{
  "manifest_version": 2,
  "name": "Opaque",
  "description": "Browser extension to safely blur sensitive text and values. Great for screen sharing and screen captures!",
  "version": "2.0.1",
  "icons": {
    "128": "/img/logo.png"
  },
  "browser_action": {
    "default_icon": "/img/logo.png",
    "default_title": "Opaque",
    "default_popup": "/pages/popup/index.html"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "all_frames": true,
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "/js/content.js"
      ],
      "css": [
        "/css/content.css"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b093e08-db70-412b-b3c3-4c2bca8512f6}"
    }
  }
}