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Firefox 137 Released with Address Bar Revamp & Tab Groups
(www.omgubuntu.co.uk)
A place to discuss the news and latest developments on the open-source browser Firefox
if you wanna test it out and its not available:
about:config ~> browser.tabs.groups.enabled ~> true
personally i find sidebery superior.
Sidebery is the best thing to happen to web browsers since tab groups
Looking at this I'm going to be sticking with simple tab groups myself. Using that via the sidebar seems way more efficient than this IMO.