Is there a way to set pixel perfect in Atom?

Question

atom

In normal browsers outside of Atom everything is fine, but with the html-preview plugin for Atom I would like to have something similar to completely eliminate any reason for alt-tab. If it’s not clear what I mean: here it is, but inside Atom:
https://addons.mozilla.org/en-us/firefox/addon/pix...
Or you can poke my nose into how to set up live-preview between Atom-Chrome/Atom-Firefox DE, so that when you open dev-tools in the browser, the auto-update process does not stop.
upd: got to this point, pixel-perfect plugins included as jQuery scripts. But still I can't plug into html-preview in Atom.