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Add-Ons Still Missing Even After Installing Firefox v. 66.0.4

I am using Windows 10 (64-bit) with Firefox 66.0.4 (64-bit).

Even after Firefox automatically installed v. 66.0.4 my add-ons are
still not visible in the top toolbar.

When Firefox 66.0.4 was installed my add-ons showed up.  However, upon
closing Firefox and restarting it, they disappeared again!

If somebody has run into this problem and found a good answer/solution
as to the cause, please post.

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