Examine source code of Image Visibility Toggle

{
  "manifest_version": 2,
  "name": "Image Visibility Toggle",
  "version": "1.0",
  "description": "Toggle the visibility of images on webpages.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/toggle-48.png",
    "default_popup": "popup.html",
    "default_title": "Toggle Images"
  },
  "icons": {
    "48": "icons/toggle-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{df04d165-e2e7-4505-ae73-8e627d920212}"
    }
  }
}