Examine source code of SessionKeep - Tab & Session Manager

{
  "manifest_version" : 3 ,
  "name" : "SessionKeep - Tab & Session Manager",
  "short_name" : "SessionKeep",
  "version" : "1.2.0",
  "description" : "Automatic tab snapshots, saved sessions with colours, search, safe backups, 15 export formats, bookmarks. All local.",
  "icons" : {
    "16" : "icons/16.png",
    "32" : "icons/32.png",
    "48" : "icons/48.png",
    "128" : "icons/128.png"
  },
  "permissions" : [
    "tabs" ,
    "storage" ,
    "unlimitedStorage" ,
    "alarms" 
  ],
  "optional_permissions" : [
    "downloads" ,
    "bookmarks" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "action" : {
    "default_title" : "SessionKeep",
    "default_popup" : "popup.html"
  },
  "commands" : {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      }
    },
    "save-window": {
      "description" : "Save this window as a session"
    },
    "save-all": {
      "description" : "Save all windows as a session"
    },
    "open-manager": {
      "description" : "Open the SessionKeep manager"
    }
  },
  "content_security_policy" : {
    "extension_pages": "script-src 'self'; object-src 'none'; connect-src 'none'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sessionkeep@digivibetech.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}