Examine source code of Screengrab

{
  "manifest_version": 2,
  "name": "Screengrab",
  "version": "1.0.0",
  "description": "Capture visible area or full webpage screenshots easily in Firefox.",
  "author": "Screengrab Team",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_title": "Screengrab",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/scroll.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "screengrab-addon-a92f@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}