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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.
behind! is a great extension for grabbing the highest resolution of images on a website. Flagfox has been around a long time and has all sorts of useful functions. I can't recommend Bitwarden to everyone enough - cross-platform and free. Also totally worth the 10 bucks a year for the premium features and developer support. AutoCopy is simple and excellent. Facebook Container blocks zuckerberg's evil little buttons on all web pages.
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.