For those of you who don't know, Google Chrome Canary is a special build of the popular web browser from Google that is very experimental, but also claimed to be very fast. Due to the fact that it may be unstable and experimental, Google elected to not allow users of Chrome Canary to set it as their default web browser.

However, for Mac OS X systems, there is a very easy workaround if you'd like to set the Google Chrome Canary build as your default web browser. Here's how to do just that: 

Step 1: Launch Safari (Applications>Safari) - it comes with your Mac, meaning you don't have to install it.

Step 2: Once Safari is loaded up, open up its preferences (Safari menu>Preferences)

Step 3: Under the General tab, find the section labeled "Default web browser," click the drop down menu, and select Google Chrome Canary as the default browser. 

Quit Safari and that's it! You've set Chrome Canary as your default web browser.