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That's a sidebar, they're not the same. It requires hacks to change the dimensions to a true split, and the things like zoom and extensions don't work the same in it. This is a half-measure at best.

"This add-on is not actively monitored for security by Mozilla. Make sure you trust it before installing." What?

I’m sure that you can piece together how this could happen.

A lot of legitimate Firefox Addons say that. Just means Moz can't manually review every single extension if they want to allow their users a good extension experience...unlike developing Chrome extensions

> Just means Moz can't manually review every single extension

The extension in question is authored by Mozilla.

Different teams.

In the case of extensions like this one should be asking , “Do I trust the author?”

I've tried it. It's not nearly half as good as Edge's split screen feature.