[notatoad]

does this actually do anything other than give you a fixed-size chrome browser? because it really isn't that hard to resize a browser window.

[qwook]

http header probably shows the browser as mobile instead of a desktop browser.

this will force most sites to show in mobile version, which usually has less overhead.

[est]

Using desktop chrome, dev console -> settings -> override -> change device to iPhone/Nexus, done.