These should be push-on and push-off, not momentary. (I believe these are described as 'maintained' or 'latching')
"Although I gave the other brand a very favorable review, I've come to prefer this one. In comparison, It’s more compact, less clunky; it’s basically metal; and the plug and power cord are combined so it’s tidier. I’m going to order two more. Once you use a foot switch, you can’t imagine not having one; this one’s a keeper."
I think these terms mean "push-on, push-off":
And these mean "push and hold for on, release for off":