Step 1

Click the Firefox button at the top-left of the screen, and then Select Help > About Firefox. Don’t click the help text, for some reason Mozilla decided to make it a link while it still contains a sub-menu; kind of annoying.  

Step 2

Once the About Mozilla Firefox window is open, it should automatically start checking for updates and downloading them.

Once the download is finished, Click the Apply Update button.  Firefox will restart, then your update should be applied. 

Done!

Your Firefox client is now fully up to date!  The about page also displays your current version information.  As shown in this tutorial, even after updating my Firefox is still at 4.0 -this is because Mozilla has started a quick-push update system that will send out minor quick-fixes; the updates aren’t large enough to validate a version change.

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