HTTP Server header Spy version history - 3 versions
HTTP Server header Spy by dw5
HTTP Server header Spy version history - 3 versions
Be careful with old versions! These versions are displayed for testing and reference purposes.You should always use the latest version of an add-on.
Latest version
Version 3.0
Released Oct 25, 2026 - 29.41 KBWorks with firefox 140.0 and later, android 142.0 and laterVersion 3.0 – a full refresh
New
• IP lookup links are now grouped by purpose and include more sources useful for security work:
– Info: ipinfo.io, infobyip.com, whatismyipaddress.com
– Threat intel: VirusTotal, AbuseIPDB, GreyNoise, AlienVault OTX, Cisco Talos
– Exposure: Censys, Shodan, urlscan.io, ViewDNS reverse IP
– Network: bgp.he.net, RIPEstat
• "Copy" button for the response headers
• Dark mode (follows your system setting)
• The QR code of the page URL is now behind a "QR code" toggle, so the popup stays compact
Improved
• The badge now shows a short server name per tab (e.g. "ngin" for nginx); hover it for the full name and IP
• The popup no longer breaks on tabs with no captured data; it asks you to reload the page instead
• IPv6 addresses now get a working link
• Updated the Censys link and removed the dead ip.cn link
Under the hood
• Moved to Manifest V3
• Removed jQuery and other unused code; the add-on is now about 20 KB
• Fewer permissions: the "tabs" permission is no longer requested
• Requires Firefox 140 or newer
Note: Firefox may ask you to allow accever Spy needs to read response headers.If the popup shows a "Grant access" button, click it and reload the page.Source code released under All Rights Reserved
Older versions
Version 2.2
Released Feb 18, 2021 - 113.98 KBWorks with firefox 48.0 and laterAdded CensysSource code released under All Rights Reserved
Version 2.0
Released Jan 2, 2021 - 112.91 KBWorks with firefox 48.0 and laterSource code released under All Rights Reserved