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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.
Also, you can use browser toolbox to inspect Firefox UI and see what styles are being applied to it and to figure out what selectors to use. Of course, there is also https://searchfox.org/ for when you need to figure out exactly how Firefox is doing some feature x.
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.