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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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If we're talking about a great implementation of the feature, it would be 'Sidebery'.
I don't think Sidebery is a great implementation unless the developers fix this bug. It can be reproduced stably and is important for users who opened many tabs and keep them between session.
https://github.com/mbnuqw/sidebery/issues/1368
Ooh, that's a fair claim! I don't use Sidebery like that, so I have never run into that issue!
I've never trusted browsers to reliably remember history and restart where I left off, so I make heavy use of Sidebery's snapshot feature.