[SOLVED!] Synaptics touchpad on Dell notebook crashes in firefox 2022 working solution

This has been a problem for literally decades and IDK why firefox can’t seem to fix it, but because reasons a Dell Precision M6500 notebook computer will lose the ability to use its trackpad/touchpad input at all in even the latest version of Firefox i literally just downloaded days ago. I found that this failure reliably happened only when I tried to scroll on a page using the “swipe down the left side of the touchpad” gesture input on the touchpad. In my case, it made the touchpad stop responding to input altogether!

One user gave a hint that SynTPEnh.exe was a problem: https://www.dell.com/community/Laptops-General-Read-Only/Touchpad-hungs-when-scrolling-in-Firefox-M6500/td-p/3692065
I verified stopping that process would let me use the touchpad again. Hold shift/control/escape and find the process, right click and tell it end task. This was possible, happily, becauses this laptop has a trackpoint as well as a touchpoint. But that only gets the mouse back, not the ability to actually USE firefox.

Happily I found the solution thanks to Jesus and user do9man on support.mozilla.org: https://support.mozilla.org/en-US/questions/895816

Mind you: this solution is from 2011. I type this in the year of our Lord 2022 and it was STILL A PROBLEM! on a brand-new installation of Windows 10, a brand-new installation of the latest Firefox ESR, with a clean new profile in firefox, I still had the exact problem. Shocking. Anyway, in case that link dies and this one somehow remains, the solution was to edit the registry. Beware that you can break your computer by editing the registry wrongly.

start-> regedit->
navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTPEnh]
add a 32-bit dword called UseScrollCursor and leave the value at the default all-zeroes. Restart the computer. Bang, you can scroll in firefox again but you don’t have the fancy cursors. IDC about the cursors i want the scrolling.

The scrolling is not super smooth for me, but it scrolls and the touchpad stays working.

So there you go.

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