Examine source code of Salesfresh

{
  "icons" : {
    "16" : "icon16.plasmo.2577fc03.png",
    "32" : "icon32.plasmo.d583dc1e.png",
    "48" : "icon48.plasmo.e0fcfb1d.png",
    "64" : "icon64.plasmo.e6259081.png",
    "128" : "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version" : 3 ,
  "action" : {
    "default_icon" : {
      "16" : "icon16.plasmo.2577fc03.png",
      "32" : "icon32.plasmo.d583dc1e.png",
      "48" : "icon48.plasmo.e0fcfb1d.png",
      "64" : "icon64.plasmo.e6259081.png",
      "128" : "icon128.plasmo.96a1ede9.png"
    }
  },
  "version" : "1.0.5",
  "author": "Ideasfresh Technology Pvt Ltd",
  "name" : "Salesfresh",
  "description" : "Create leads and contacts in your Salesfresh CRM from Gmail and Outlook, and manage your activities from the side panel.",
  "background" : {
    "scripts" : [
      "static/background/index.js" 
    ]
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html"
  },
  "permissions" : [
    "storage" ,
    "activeTab" ,
    "scripting" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "https://mail.google.com/*" 
      ],
      "js" : [
        "gmail.02e1ee3f.js" 
      ],
      "all_frames" : true ,
      "css" : []
    },
    {
      "matches" : [
        "https://www.salesfresh.com/*" 
      ],
      "js" : [
        "contents.a5b44d35.js" 
      ],
      "all_frames" : false ,
      "css" : []
    }
  ],
  "host_permissions" : [
    "https://mail.google.com/*" ,
    "https://outlook.office.com/*" ,
    "https://outlook.office365.com/*" ,
    "https://outlook.live.com/*" ,
    "https://outlook.cloud.microsoft/*" ,
    "https://www.salesfresh.com/*" ,
    "https://www.salesfresh.com/api/*" 
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@salesfresh.com",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "personalCommunications",
          "authenticationInfo"
        ]
      }
    }
  }
}