I installed the new update 7.0.1. When I open the program, a small box with an error message pops up: "---------- TypeError: Components.classes[cid] is undefined."

It has an OK button. When I click it the program opens.
Why is this? How do I get rid of it?
I have tried deleting, downloading the update again, reinstalling it twice. This didn't help.

This issue can be caused by an extension that isn't working properly.
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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