I tried to enable Email/Password sign in method in Firebase Auth. When I click on the save button it gives error "Error updating Email/Password".
Please look at this image:
I already added Firebase to my Android app.
This problem usually happens if you are using an Antivirus, VPN, or proxy as this might block your connection so I recommend disabling them all.
Try to disable all your browser extensions as they might also block your connection.
If all the above steps did not work, try using a different browser preferably Google Chrome with an incognito window as Frank van Puffelen mentioned in the comments.