Firefox doesn't open on my laptop. Why?

When I click on the Firefox icon on my taskbar, it doesn't open. I also tried using the icons in the "Start" icon. I restarted the computer, checked with McAfee if it was blocking it (which it isn't), etc... but still can't open Firefox.
Why? Can someone help me please?

I´ve tried, but it doesn´t work at all. Only in Private Browsing Modus. Don´t know, what I should do. It´s only on my Laptop. I have this Browser on my PC and there it works. Also Waterfox, it´s all the same.

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