a single window

Depending on the content, but yes, it's possible.

If that seems too much, try restarting into Troubleshoot Mode (from Help menu) to skip any extensions that may hamper the collection effectiveness and leak objects… and then look into Task Manager - see whether tabs or extensions are slowing down Firefox for a breakdown what content/process consumes your resources.

I have deleted how much addition and reduced consumption in half, how do I know which extensions consumed from the resources of the device from the task manager only shows me the browser

In about:processes described above you'd see Extensions entry, I'm not sure these would be listed one by one, but more likely just all lumped together, alas.