The issue seems to be fixed in the current version of gtk in Ubuntu
13.10
** Changed in: ubuntu
Status: Triaged = Fix Released
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This isn't likely to be a Firefox bug. It happens in Thunderbird, Chrome
and Chromium too and only occurs on Ubuntu 13.04 onwards. Reassigning to
gtk for now
** Package changed: firefox (Ubuntu) = gtk+2.0 (Ubuntu)
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Desktop
Errr, I mean, it happens in Thunderbird and Chromium. Not Chrome,
because it uses its own webui for the printing interface
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https://bugs.launchpad.net/bugs/1090174
