I've installed Visual Studio 2017 for MacOS and i would like to know if its possible to install Web Essentials (and other similar extensions) on that VS version?
I tried to manually select the .vsix file from VS but nothing happens.
The answer to a similar question indicates that the standard Visual Studio extensions do not work on the Mac version because it is based on an entirely different product, Xamarin Studio. Microsoft bought Xamarin a while back, so it looks like they've just taken the Xamarin product, modified it a little, and rebranded it.
There is, however, a collection of extensions for Visual Studio for Mac, and you can take a look at the question I linked to to find instructions on how to install those. I have no idea is Visual Studio Essentials is available for the Mac version, since I'm currently unable to view that extension repository. I think that it is unlikely that you'll find a version for the Mac version of Visual Studio, but check it out and see if you can find the extension or something similar..