Examine source code of SnapDiff

{
  "manifest_version" : 3 ,
  "name" : "SnapDiff",
  "description" : "Capture pages, compare A/B screenshots, annotate, and save locally.",
  "version" : "0.1.6",
  "icons" : {
    "16" : "icon-16.png",
    "32" : "icon-32.png",
    "48" : "icon-48.png",
    "128" : "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "snapdiff@snapdiff.co",
      "strict_min_version": "153.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "permissions" : [
    "activeTab" ,
    "scripting" ,
    "storage" ,
    "downloads" ,
    "alarms" 
  ],
  "host_permissions" : [
    "https://us.i.posthog.com/*" 
  ],
  "incognito" : "not_allowed" ,
  "content_security_policy" : {
    "extension_pages": "script-src 'self'; object-src 'self'; worker-src 'self'"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "action" : {
    "default_title" : "SnapDiff",
    "default_popup" : "popup.html"
  },
  "options_ui" : {
    "open_in_tab": false,
    "page": "options.html" 
  }
}