Clacks Overhead - GNU Terry Pratchett icon

Clacks Overhead - GNU Terry Pratchett

by Peter Bell · Just for Fun
FeaturedManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

GNU Terry Pratchett. Show user when 'Clacks-Overhead' appears in HTTP headers.

Users
6,000
0 in 30 days
Rating
4.8 / 5
−0.12 in 30 days
Ratings
163
0 in 30 days
Store rank
#12K
#11K among extensions
Version
3.0
updated 26 Oct 2024

Users

monthly, 3 years
1,0003,5006,000Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 6,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
50106163Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 163 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Clacks Overhead - GNU Terry Pratchett

This extension is a tribute to the late Terry Pratchett (https://en.wikipedia.org/wiki/Terry_Pratchett). It displays an icon when the user visits a website sending a "Clacks Overhead" message. If the user clicks on the icon, it will display the message and animated clacks semaphore code. More information can be found here: http://www.gnuterrypratchett.com/ Notes: 1. This extension does not collect any data or send any information anywhere. 2. All code is open source on Github: https://github.com/newfolder0/chrome-clacks Contributors: - Peter Bell (original author) - Charlie Wheeler-Robinson (bug hunting, refactoring, improving in early versions) - Jimmy Nyström (code) - Melanie Wilberforce (icons) - Rob Grundy (who made the Firefox extension) for sending me the clacks icons used in the animation - Backspindle Games for producing the clacks icons in the animation - Sap1ens, jwakely, and Amy Atha-Nicholls (generously offering new icons) - yousuf811 on Github (squashing bugs) - Jarek Glowacki for some CSS help - Jake Heimark (hmk on GitHub) for fixing the manifest and keeping this extension alive in 2024 -See GitHub issues and pull requests for others

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%0−0.12
30 days0+0.0%0−0.12
6 months0+0.0%0−0.12
1 year0+0.0%+1−0.12

Version history

2 versions recorded
3.026 Oct 2024
2.021 Dec 2019

Details

Category
Just for Fun
First seen
21 Dec 2019
Size
464 KB
Languages
en
Pricing
Free
Extension ID
lnndfmobdoobjfcalkmfojmanbeoegab

Permissions and risk

Minimal riskimpact 3, likelihood 0
Permissions
activeTabwebNavigationwebRequest
Site access
https://*/*http://*/*
Can read and change data on every website you visit.

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