Modified for 4.0 Rated 5 out of 5 stars

Ok everyone here is a modified version that will work with Firefox 4.0

I modified it via the instructions in gtmb's comment and it works well. Just download then drag and drop into the browser and hit "Install"

This review is for a previous version of the add-on ( 


Thanks for the assist. I've recently updated it to support 4.0.*. I've also added it to GitHub. The CheckFox project (and the XPI most users would be interested in) can be found here:

For those willing to wait, it's been submitted to Mozilla Add-Ons, as well.