Why the 'options' window has changed and how can I change this back?

I went to open my window options under the Tools tab what I do every day because I have to clear the cache manually to resolve wifi problems. today when I opened it, instead of the unfamiliar floating window it opens a Web page in a new tab. I wonder if it's supposed to be the case and if there is a way to change this back to the 'normal' that I really don't like the way it looks and it does not work now when I empty my cache.
Thank you!

When that day arrives, someone could get the code for the elders of dialogue and launch as an add-on. Wouldn't be the first time something like that happened.

Tags: Firefox

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