Examine source code of RSVP Reader

{
  "manifest_version": 2,
  "name": "Toastys Speed Reader",
  "version": "1.0",
  "description": "Paste text and read it fast",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "overlay.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "toastys-speed-reader@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_information": false,
        "uses_tracking": false
      }
    }
  }
}