> Please add gesture for switching tabs.
The API provided by Firefox is unstable, but you can use it by turning on “Enable experimental features” on the settings page.

> And maybe add two finger swipes.
Sorry, it will take some time to work on this.
I'll add it to the issues list.
https://github.com/utubo/firefox-simple_gesture/issues/99

Thank you for your review.

2025/02/25
> And maybe add two finger swipes.
v3.27 supports this.