Examine source code of Save Tabs for Later

{
  "manifest_version": 3,
  "name": "SessionStash - Save Tabs for Later",
  "version": "1.0.2",
  "description": "Save your tabs and open later.",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "128": "images/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "error_codes.js",
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "https://api.sessionstash.site/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "sessionstash@sessionstash.site",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "browsingActivity",
          "websiteActivity"
        ]
      }
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src https://api.sessionstash.site"
  }
}