Examine source code of QuickScreenshot

{
  "manifest_version": 2,
  "name": "Screenshot Area Capture",
  "version": "1.2.0",
  "description": "Click to select and capture any area with auto-scroll support. Captures video and canvas elements. Copies PNG to clipboard.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Capture Screenshot Area"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite",
    "clipboardRead",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "screenshot-area-capture@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}