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Firefox Sidebar and Vertical tabs: try them out in Nightly Firefox Labs 131 – Firefox Nightly News
(blog.nightly.mozilla.org)
This is a most excellent place for technology news and articles.
Well, I tried it and it looks good. I'm glad they are adding something new to the browser. It's been a long time since that happened it feels like.
It's buggy still though and still in development.
Just this past year