I get a pop-up error message when I try to open Firefox

Whenever I try to open Firefox (latest version installed today), I get a pop-up error message that reads: TypeError: Componentsclasses['@mozilla.org/gmailnotifier;'] is undefined.
When I click the OK button, Firefox opens and operates fine. How do I get rid of that?

Troubleshooting extensions and themes
* https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
Check and tell if its working.

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