Oh, sorry.
I supported two-finger swipes, but forgot to support two-finger taps.
Might take some time.

I create a new issue.
https://github.com/utubo/firefox-simple_gesture/issues/102

thanks.

(2025/06/08)

v3.30 supports it.
(But 2 or more fingers double-tap is not yet supported.)

thank you for your review.