Display the X-Clacks-Overhead in Clacks Semaphore

  • GNU_Terry_Pratchett
  • GNU_Terry_Pratchett
What is GNU_Terry_Pratchett?
'GNU_Terry_Pratchett' is a Firefox add-on that displays the 'X-Clacks-Overhead' message embedded in website headers as a tribute to the late Sir Terry Pratchett. Users can visualize the message through the semaphore style from the 'Clacks' board game. It's an e-tribute to respect and remember the renowned fantasy author and his iconic Discworld series.
Users: 1,403 ▼ -1
Rating: 4.67 (18)
Version: 0.5resigned1 (Last updated: 2024-04-25)
Creation date: 2015-03-17
Weekly download count: 6
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
  • webRequest
  • tabs
  • alarms
  • <all_urls>
Size: 619.53K
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
Want to check extension ranking and stats more quickly for other Firefox add-ons? Install Chrome-Stats extension to view Chrome-Stats data as you browse the Firefox Browser Add-ons.
Chrome-Stats extension

In tribute to the late Sir Terry Pratchett many websites are adding the message "GNU Terry Pratchett" into the html header "X-Clacks-Overhead". This plugin allows you to see when a website is using the header and read the message included. The message is also displayed visually in the semaphore style from the upcoming board game "Clacks" by Backspindle Games.

Concept: Richard Atha-Nicholls Art: Amy Atha-Nicholls Coding: Rob Grundy

User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Helps to honor the memory of Terry Pratchett
  • Some users reported bugs and errors in the code
Most mentioned
  • Bug in the code
  • Patching the code
  • Support for 57
Recent reviews
Works good
by Anthony Williams, 2024-05-11

View all user reviews
Risk impact

GNU_Terry_Pratchett is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install GNU_Terry_Pratchett if you trust the publisher.

Risk likelihood

GNU_Terry_Pratchett is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Upgrade to see risk analysis details