[Bug 330762] [NEW] <Ctrl>F4 closes two tabs instead of one

[n0nick]

Public bug reported:

Binary package hint: ubufox

When using the <Ctrl>F4 combination to close a tab, another tab is closed immediately after the current one.
I managed to stop this behavior by disabling the "Ubuntu Firefox Modifications" add-on.

User Agent string:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.6) Gecko/2009020911 Ubuntu/8.10 (intrepid) Firefox/3.0.6 Ubiquity/0.1.5

Ubuntu version:
$ lsb_release -rd
Description:	Ubuntu 8.10
Release:	8.10

Package version:
$ sudo apt-cache policy ubufox
ubufox:
  Installed: 0.6-0ubuntu1.8.10.1
  Candidate: 0.6-0ubuntu1.8.10.1

** Affects: ubufox (Ubuntu)
     Importance: Undecided
         Status: New

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<Ctrl>F4 closes two tabs instead of one
https://bugs.launchpad.net/bugs/330762
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