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tampermonkey
Tampermonkey is the most popular userscript manager, with over 10 million users. It's available for Chrome, Microsoft Edge, Safari, Opera Next, and Firefox.
I want to chime on that as it's worth noting that Tampermonkey is no longer open source. I mean it's like that for years - its GitHub repo clearly stands it's just an archive version and commits there date back to 2018. Here's one of the first posts when author went proprietary license and started gaining data (with his comment btw) and technically there's also Security section in FAQ and full Privacy Policy. Also FWIK website is the only place you get info about changes - highlighting that to stop looking for insights on GitHub.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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violentmonkey
Violentmonkey provides userscripts support for browsers. It works on browsers with WebExtensions support.
(And yes, after that I personally pivoted to Violentmonkey. Overall it's good to have a choice :)