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It's a progressive enhancement. It doesn't break other browsers.

If the widely supported <input type="tel"> or <input type="phone"> offer a better user experience on average for your users, it's not an enhancement at all. Not yet, at least.

I just took a close look at the caniuse page [1]. It says that inputmode also works in Mobile Safari on iOS 12.2, which is at Beta 6 [2]. Firefox's mobile market share is 0.58%, and the market share for old versions of Mobile Safari is at 2.51% according to the caniuse page so it's probably not worth waiting on Firefox. I think it will be a good choice very soon, maybe in a couple of months, because it's still possible to enter numbers with the regular keyboard.

1: https://caniuse.com/#search=inputmode

2: https://en.wikipedia.org/wiki/IOS (Latest preview in the infobox)

Nor is input type="number", given how each OS will offer a different on screen keyboard.