Rated 5 out of 5 stars

always glad to see this instead of the normal error page, having it auto reloads also a great feature. btw ive also made a port of this for Palemoon if you goto http://forum.palemoon.org/viewtopic.php?f=16&t=3365&p=19175 - two versions with one alittle smaller than the regular FF logo, the other alittle bigger, and gave it some shadowing, so not a flat white background (its a diy replacement of the one file in this addon so still need this)

edit, lol, i never even read the description of this addon, im embarrassed. Well at the link above, ive uploaded images of the templates used, so they can be uploaded to the custom generator, anyway. I'll mention the overlook at the forum page to clarify. thanks

This review is for a previous version of the add-on (1.3.20130808.1-signed.1-signed). 

I've created a generator for making custom extensions, available at http://realityripple.com/Software/Mozilla_Extensions/Fierr/customized.php .