Firefox Update Error

So, on one of my computers, I've had problems updating Firefox. When going to Help > Check for Updates, I'd get the error: "".

Well, after some research, I found that the app.update.url setting in the Firefox configuration was wrong, or at least pointing to something invalid. My original update url was:
https://aus2.mozilla.org/update/2/%PRODUCT%/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/update.xml

If you're having that problem too, then try this:

1. Open a new tab
2. In the address bar, type about:config and hit enter
   
3. In the Filter, type app.update.url
4. Double-click this property
5. In the dialog that pops up, enter the following path (which is almost identical):
   
   
   https://aus2.mozilla.org/update/1/%PRODUCT%/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/update.xml
   
   Note: when you copy and paste this, make sure you get all of it. Easiest way is to right-click the URL and click 'Copy Link Location'.
   
   
   
6. Click Ok
7. Try Help > Check for Updates

Voila! Now you should be able to receive automatic updates for Firefox.

Enjoy!