Enable touch-scrolling in Firefox

I finally found a solution: start firefox with:

env MOZ_USE_XINPUT2=1 firefox

This enables touch-scrolling for me. Pinch-to-zoom does not work for regular web pages, but it does work on some selected web pages such as Google Maps or OpenStreetMap.

Edit /etc/security/pam_env.conf and add this line:
```
MOZ_USE_XINPUT2 DEFAULT=1
```
reboot

see https://askubuntu.com/a/994483/34298

Enable touch-scrolling in Firefox

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