Circadian by Pasithea
A browser extension that tints pages by time of day (daytime, sunset, bedtime).
Available on Firefox for Android™Available on Firefox for Android™
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About this extension
Circadian is really simple. It creates an invisible element over your whole web page, then applies a CSS filter to it! There's a bit of math involved to calculate the RGB values from the blackbody radiation scale, but that's essentially it!
Philosophy:
Blue-light impacts our sleep and overall health by disrupting melanopsin receptor's normal function that calibrates our circadian rhythm. This extension's creation was inspired by f.lux's ability to adjust your device's color profile temperature based on the time of day to aid in preventing this. It's not perfect (this extension definitely isn't) but it's a simple tool many users use to help.
The idea: I was checking out some dark reader Firefox addons when I asked myself if any of these dark reader addons had temperature adjustments? I suspect not. And if I were to make an extension, I could use Orion on my iPhone to install my extension and essentially get f.lux on my iPhone! (Apple shut down f.lux's app) Obviously it's not system wide, but still kinda neat!
You can even pair Circadian with other dark reader extensions to get the best experience!
Philosophy:
Blue-light impacts our sleep and overall health by disrupting melanopsin receptor's normal function that calibrates our circadian rhythm. This extension's creation was inspired by f.lux's ability to adjust your device's color profile temperature based on the time of day to aid in preventing this. It's not perfect (this extension definitely isn't) but it's a simple tool many users use to help.
The idea: I was checking out some dark reader Firefox addons when I asked myself if any of these dark reader addons had temperature adjustments? I suspect not. And if I were to make an extension, I could use Orion on my iPhone to install my extension and essentially get f.lux on my iPhone! (Apple shut down f.lux's app) Obviously it's not system wide, but still kinda neat!
You can even pair Circadian with other dark reader extensions to get the best experience!
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Permissions and data
Required permissions:
- Access your data for all websites
Optional permissions:
- Access your data for all websites
More information
- Add-on Links
- Version
- 1.0.1
- Size
- 75.59 KB
- Last updated
- 5 days ago (Nov 1, 2025)
- Related Categories
- License
- MIT License
- Version History
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The developer of this extension asks that you help support its continued development by making a small contribution.