Update:
I was unable to send my email via Firefox. I'd typed my message, and clicked on the "Submit" button, but nothing happened. I then noticed that the button was disabled! (I'd previously discovered that the Connection Type and Operating System drop-downs were also disabled, but I assumed that was "by design" for whatever reason.)
I then loaded the URL into my Pale Moon browser, logged in, and used copy/paste to put my information (i.e., the message I'd typed, the printer SN, etc.) into the form on Pale Moon.
The "Submit" button was now activated -- it had a red background, rather than the light gray background it had in Firefox -- and, the two drop-downs mentioned above were also operational.
For whatever reason, the form would not function in Firefox! You might want to pass that along to whoever's responsible for maintaining browser compatibility.
This was a new experience for me! (Usually, it's Pale Moon that gives me compatibility issues, which I resolve by running Firefox.)
PS: I had ensured that NoScript and so forth were set so as to not interfere in any way. It seemed to me to be entirely due to some glitch that would not allow the form to operate when loaded in Firefox.
