[CentOS] Problems with latest Firefox update -- can't install new extensions

Since the latest Firefox update to 45.7.0 on my CentOS 6.8 system, I can 
no longer install add-ons/extensions. Things LOOK like they're working 
but the extensions don't get stored in my normal area and they don't 
appear in my Add-Ons menu. Is anyone else having this issue?

It has been a while since I added any new extensions so I can't say WHEN 
exactly this problem happened but .... :(
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MzK

"Trust, but verify."
       -- Ronald Reagan