I'm ashamed I didn't put this in my original post! I can't recreate it on my machine at home although they both run the Debian testing branch and use Iceweasel

I'm ashamed I didn't put this in my original post! I can't recreate it on my machine at home although they both run the Debian testing branch and use Iceweasel. I'll let you know tomorrow but it's probably PEBKAC.