Rated 5 out of 5 stars

Love this add-on. I designed my first website heavily relying on XUL and XBL. My site has problem generators for Mathematics and I use it to prepare my students. Unfortunately, none of the content is PRINTABLE now. Print preview shows none of the content. Is there a fix to this for this add-on or is it a Firefox 4.0 issue? Hope to see this issue fixed soon. Thanks for a great app.

This review is for a previous version of the add-on (1.0.1-signed). 

I tested and confirmed this problem. Unfortunately, it's Firefox doing this, and since Remote XUL is being discontinued, I don't think this bug will ever be fixed. Your best bet in this case would be to take a screenshot, perhaps using one of many screenshot add-ons available.