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Google Chrome will limit ad blockers starting June 2024
(arstechnica.com)
This is a most excellent place for technology news and articles.
https://addons.mozilla.org/en-US/firefox/search/?q=Tab%20groups
This is definitely a feature that needs to be an addon rather than in core Firefox, as it could easily interfere with users who organise tabs in different ways (e.g. Tree tabs)
Right now there's no built in options and it could just be deactivated.
Also the add ins I've seen still lack chrome's feature of auto grouping. They just allow me to manually group.