Through some lucky keyboard-mashing I stumbled across a couple of useful developer features in Google Chrome, including an option to disable the cache, and settings for device testing. Here’s how to:

  1. Bring up the inspector: ⌥ ⌘ i
  2. Hit fn F1

Voilà!

The general tab with cache options:

The overrides tab with device options:

I’ve popped some easter eggs in this post to amuse future-me.