Notes

Firefox

Enable about:config on mobile Firefox

Go to chrome://geckoview/content/config.xhtml

Set "general.aboutConfig.enable" to true

Bonus: go to about:config and disable "dom.private-attribution.submission.enabled

USB

HID Report descriptor

cat /sys/kernel/debug/hid/0003\:[device]/rdesc

when lsusb refuses to show it

might need a root shell