Checks website security headers exist, formats the Content-Security-Policy (CSP) and Feature-Policy (FP) headers into an easy to read table, makes suggestions and sets a header for websites with a key that could be used to enable a debug mode.

Dev Headers - Firefox Add-On
Dev Headers is a Firefox add-on that checks the existence of website security headers, formats Content-Security-Policy (CSP) and Feature-Policy (FP) headers into an easy-to-read table, makes suggestions, and sets a header for websites with a key that could be used to enable a debug mode.
Add-on stats
Manifest V2
By: Craig Francis
Firefox on Android: No
Permissions:
- tabs
- storage
- webRequest
- webRequestBlocking
- <all_urls>
Size: 81.53K
Email: cr*****@craigfrancis.co.uk
URLs: Website
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
Add-on safety
Risk impact
Dev Headers requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
- Low ******* ****** ** *** ********* ********
Risk likelihood
Dev Headers has earned a fairly good reputation and likely can be trusted.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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