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Firefox Devs Working on Tab Previews
(www.omgubuntu.co.uk)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
That is nice and yeah, I'm talking about the default experience you can get with Firefox for macOS, if it is any different in any other OS I wouldn't know, now if you know about a good customizing guide I'd appreciate it...
There's a bunch of different ways you can customize it.
EDIT: Oh and there are of course addons and themes too