Examine source code of Accessibility Scanner — WCAG & Contrast

{
  "manifest_version" : 3 ,
  "name" : "Accessibility Scanner — WCAG & Contrast",
  "version" : "0.3.1",
  "description" : "Test any page for WCAG issues: color contrast, alt text, form labels, headings. Outlined where they are. No login, no email.",
  "action" : {
    "default_popup" : "popup.html",
    "default_title" : "Accessibility Scanner",
    "default_icon" : {
      "16" : "icons/icon16.png",
      "48" : "icons/icon48.png",
      "128" : "icons/icon128.png"
    }
  },
  "icons" : {
    "16" : "icons/icon16.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "permissions" : [
    "activeTab" ,
    "scripting" ,
    "storage" 
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "accessibility-scanner-webext@accessibilityscanner.app",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}