A couple times now, when I tried to type a single character, I'd get a dialog that asks "Tell us what you're doing".
The first time I thought I'd crashed so I took care to give them a careful explanation. But afterward I discovered that I had not crashed.
They just wanted to know what I'm doing. What I'm trying but failing to do is post on the tubes.
This second time I typed a single letter "x". I thought I had it fooled but when I tried to type again the dialog came back. Just when I thought it was safe to go back to the browser.
I typed a few words of random gibberish, but no that didn't work. They must check the spelling.
After the third time I closed the tab.