Vivaldi uses the Chromium engine that Chrome uses, but without all the tracking that Chrome proper has. It's also far more customizable than Chrome, and has a few more builtin features that Chrome requires you to install extensions to use. If you still want though, it will use any and all Chrome extensions, except themes.
I don't know about the Facebook/Messenger question as I don't have a Facebook account.
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Frederick J. Barnett
Someone's got to take the responsibility if the job's going to get done! Do you think that's easy?! - Gregory Peck, The Guns of Navarone.
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