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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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It has better customization, better performance, and tab groups. I used TST for many years, switched to Sidebery only a few months ago. You can do stuff like set it to where tabs only activate on releasing the mouse, so you can rearrange unloaded tabs without activating them, or make it so middle clicking the tab close button unloads it instead. You can also rename tabs!
Finally got around to trying it, and yeah - this is much better! Thanks for the recommendation!