Examine source code of Image Optimizer V2

{
  "manifest_version": 2,
  "name": "Image Optimizer V2",
  "version": "1.3",
  "description": "Optimize and compress images directly from the browser.",
  "permissions": [
    "contextMenus",
    "downloads",
    "scripting",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d8e45ab-c324-4f7e-afdd-548bec00c175}"
    }
  }
}