Examine source code of Screenshot Tool

{
  "manifest_version": 2,
  "name": "Screenshot Tool",
  "version": "1.0.0",
  "description": "Capture a full-page screenshot and download as PNG or JPEG.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5abdb10-2e3d-4a97-b34b-86c097571085}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "res/icon16.png",
      "32": "res/icon32.png",
      "48": "res/icon48.png",
      "96": "res/icon96.png",
      "128": "res/icon128.png"
    },
    "default_title": "Screenshot Tool",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "res/icon16.png",
    "32": "res/icon32.png",
    "48": "res/icon48.png",
    "96": "res/icon96.png",
    "128": "res/icon128.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}