This bug happends to my 64bit Ubuntu Installation too.
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package ttf-mscorefonts-installer 2.6 failed to install/upgrade: subprocess
post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/362176
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I can confirm that this bug is in Ubuntu Hardy Heron.
I have firefox 3.0~b5+nobinonly-0ubuntu2. (the Firefox version pre-installed in
Ubuntu.)
The bug appear only if the tab is being closed, not when you leave the
page.
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When I close a tab that has a Gmail page loaded, firefox crashes