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FirefoxCSS-Store
A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
WaveFox offers Photon style tabs
You can try RainFox, it brings back Photon icons and reverts the most annoying Proton changes (like inconsistent context menus), although I haven't updated it for a pretty long time (looking for successors/contributors, btw!)
black7375/Firefox-UI-Fix - the proton style.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.