On my Macbook Pro, the latest version of Firefox won't recognize the "Command-W" command to close windows or the "Command-C" command to copy / paste text.

I'm fine when I use Chrome and Safari -- but I'd rather use Firefox. I have done a clean reinstall of Firefox and I'm still having the problems. Any ideas?
–Harry

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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