It's been a few years now, and they still haven't fixed so you can copy and paste text in their text inputs.
I'm using Firefox 100 on Monterey, but I'm sure it worked on previous Firefox versions on Windows 10.
In the 11+y I've been on Reddit, never seen that behavior
I'm using Firefox 100 on Monterey, but I'm sure it worked on previous Firefox versions on Windows 10.