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Fenix
Discontinued ⚠️ Fenix (Firefox for Android) moved to a new repository. It is now developed and maintained as part of: https://github.com/mozilla-mobile/firefox-android
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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.
Firefox for Android was rewritten pretty much from scratch circa 2020. Collections are one of its many unfinished and poorly-thought-out features, and they never got around to implementing the ability to sync Collections to desktop. It was a known problem in 2019, while the rewrite was being worked on, and Mozilla doesn't appear to have given it any attention in the years since.