"To investigate, I used a small Teensy microcontroller to measure click-to-photon latency. It acts as a USB HID mouse and is paired with a light sensor pressed against the screen. I flashed it with an existing Open Source LDAT sketch, with slight modifications. The resulting setup can log hundreds of samples to a CSV file, unattended." Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0
Did mess with it some more: Opera/9.80 (Windows NT 6.1; U; zh-tw) Presto/2.7.62 Version/11.01
Opera/9.80 (Windows NT 5.1; U; cs) Presto/2.7.62 Version/11.01
406: Mozilla/5.0 (Windows NT 5.1) Gecko/20100101 Firefox/14.0 Opera/12.0
Mozilla/5.0 (Macintosh; Intel Mac OS X 14; rv:140.0) Gecko/20110101 Firefox/140.0
Maybe just remove it? 406 browser not supported
for ESR Firefox 140.
We must be geniuses, lol.