Numeric Key Pad is not working. How do I fix this?

FireFox is an excellent browser but I am now unable to use the Numeric Key pad and at times the whole keyboard will not work until I reboot.
Where is it that I would change whatever settings to use the Numeric Key pad.
The Key Pad works fine otherwise.
I assume the keymap has been remapped?

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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