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Why did Firefox render Lastpass inoperable or reinstallable?

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Today, 5/5/19 firefox rendered lastpass inoperable and it was no longer downloadable from the add-on site. I'm not using Firefox until you renable use of Lastpass.

Today, 5/5/19 firefox rendered lastpass inoperable and it was no longer downloadable from the add-on site. I'm not using Firefox until you renable use of Lastpass.

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Sorry, there is a Firefox 66.0.4 update available to fix this problem. See: Update Firefox to the latest release.

Background: a certificate required to verify add-on signatures expired, and all versions of Firefox need a new certificate installed.