To manually install MeeTimer into Firefox:
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Remove any existing versions of MeeTimer you have.
(In Firefox, Tools -> Addons, then find MeeTimer and click Uninstall. Now restart Firefox.)
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Download meetimer_0-21.xpi (remember where you save it!)
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In Firefox, click 'File' then 'Open File'
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Select the meetimer_0-21.xpi file you just downloaded
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Install like a normal addon
Back to http://getmeetimer.com