Look good and some adaptations/changes when I am using it on FF:
- shorten the first line “Disable Pi-hole for  minutes” and put the entry field in the line.
- text-line underneath: “Enter 0 to manually enable”
- max value 99 minutes timeout or zero for manually enable
Cosmetic: when Pi-hole is running make the big button red and when Pi-hole is inactive make the button green and maybe change the wording to: OFF and ON in bigger letters.
You can also consider to use the Circle with standing Bar sign for on/off and make it black when on. As soon as you deactivate the display the word “disabled” and the on/off sign fade to grey. When the timeout is past, then display the word “enable” in black and also the switch. Also if manually Pi-hole is reactivated.
When you are advanced then you can also grey out the icon in the icon bar when Pi-hole is deactivated.
But it works now at is and I hope not to need it that much.