I think Yucandu has (custom) hardware (like something based on an esp32 circuit board) that he wants to flash with new firmware, and you generally do that via a com-port (remnant of an old type of connector). Oversimplified: These days com-ports are simulated over usb, and (for now) only chrome-based browsers can actually send the firware over these simulated ports. An example is the flasher for Meshcore devices.
I have no idea what any of that means
I think Yucandu has (custom) hardware (like something based on an esp32 circuit board) that he wants to flash with new firmware, and you generally do that via a com-port (remnant of an old type of connector). Oversimplified: These days com-ports are simulated over usb, and (for now) only chrome-based browsers can actually send the firware over these simulated ports. An example is the flasher for Meshcore devices.
I… Don’t even see why you would want a browser to be able to do that. Seems like really trying to increase browser security issues on purpose.
Because it’s easy and convenient. I have esptool installed and I still usually flash via the browser.