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Mozilla Firefox is Working on a Tab Grouping Feature
(news.itsfoss.com)
This is a most excellent place for technology news and articles.
About. Fucking. Time.
An option for an additional tab row would be nice as well. I'm not going to use the dev version to get that working (the only way to do so right now with an add-on)
Not the only way, been using the regular firefox version with multirow enabled via css mod applied.
I was led to believe that was not possible.