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Emulating Retina Display in Firefox

Here is a handy tip to test out your retina website in Firefox when you don’t have a retina display.

  1. Open up about.config in your URL bar. Read the warning if you have not messed with settings before.
  2. Find “layout.css.devPixelsPerPx” preference.
  3. Change the value to 1 for normal and 2 for retina.
  
  

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