+ and - keys no longer zooming in Firefox

[Liam Proven]

This is odd. A few days ago, the numeric keypad [+] and [-] keys
stopped working for text zoom in Firefox. I'm on 3.0.6 on Ubuntu 8.10,
all current, everything else working fine. No recent software changes.

Google finds nothing relevant but it's hard to search for + or - as
they are operators in Google searches...

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