Prevent selection being greyed out in iframe in Firefox without using contenteditable

Question

In Firefox 3 and later (and probably older versions), selecting content within an iframe always seems to use the grey selection background colour used for a document that doesn\

Answer 1

There is a property of the iframe exposed in Firebug's DOM inspector contentDocument->designMode which is set to false for you iFrames. Forcing it to true through the DOM inspector enables the blue highlight you're after.