I used to use the old version before Firefox 57 and it worked great but now that I upgraded to Firefox Quantum I had to change to this version (Print Edit "WE") and wow what a mess. It hardly ever works. Either a blank page, a page with a spinning wheel, or minutes later a popup will appear. Just to print preview!!!! This is ridiculous! It's faster just to preview in a PDF now! - Note that I am on a Mac with Firefox 58 - after reading some other reviews from people on the same, it sounds like I am not the only one with this issue. Hopefully this can be fixed soon!