All info on that site is several years stale and the site itself is unmaintained (last update 2022; git repo permanently archived 2024). Many of the details are not reflecting current state of things and this page is not a good resource for comparing browsers in 2026 (except as inspiration for replicating their methodology¹).

Konform Browser is to my knowledge the only up-to-date webextension-capable browser today with literally 0 phone-home / background connections under defaults, and no telemetry or other superfluous undesired activity ever. (disclaimer: am dev. I’m certain it would be ranking as top if such a ranking was made today. Come @ me ;))

¹: Separately recently published container-based flow for doing this kind of analysis and doing similar comparison. There are some basic results and comparison included in readme but would be cool to see someone take it to the next step, drill deeper, share more exhaustive and educative results, present it in a format more digestible for non-techies (whether using this setup or something different).