Firefox and Google Chrome can no longer be opened?

I've always used Firefox so far, but two weeks ago it suddenly wouldn't open. I've really tried everything: start in safe mode, uninstall and reinstall, etc. I don't have any viruses on my laptop either. Then I installed Google Chrome and wanted to use that instead. But the same problem occurred. Microsoft Edge works, but it's not exactly a good and safe browser. So I wanted to ask if anyone has any idea what the problem is or how I could fix it!

It would be interesting to know how exactly that expresses itself.

Is there a process running in the Task Manager?
Does the window open briefly or does it not appear at all?
Have the browsers been installed normally?

No, there's no process running in the task manager. The window flashes briefly for a millisecond and then closes again. The browsers were installed as normal.

I'm really sorry, then I'll be out of my mind. Safe mode would have been my next attempt, so you can usually fix the problems that come from the browser itself.

So I would rather guess that it is your system. Perhaps use the "ask the question again" option here.