This is true for any application - I'd suggest you try something like
glipper, which holds clipboard data throughout your gnome session.
** Changed in: firefox (Ubuntu)
Status: New => Won't Fix
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clipboard data lost
https://bugs.launchpad.net/bugs/134847
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** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/8998292/Dependencies.txt
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clipboard data lost
https://bugs.launchpad.net/bugs/134847
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