Blur Interfaces of TeXworks on MacBook Pro with Retina Display？
You can use Retinizer:


  
  
  Retinizer is a small app I wrote that allows apps that aren’t retina ready and are displayed pixelated at 1x to display their UI widgets at 2x. That way, only their custom images will look bad and not the whole app.


Tested, and works great:

Before:


After: