referrer header error message when adding a comment

Hello,
I'm trying to add a comment to a bug report (that I made myself), but I'm getting an error message. It's a long, long bunch of unformatted red text, which I won't post unless it's necessary. It seems to be about the referrer header.

I use Firefox, and normally keep the referrer header set to zero, so it doesn't get sent. But I specifically have changed it, so that I can post a comment. But I still keep getting the error.

Now I don't know what to do, to be able to post a comment. When I made the bug report yesterday, I changed the referrer header setting, and the report was posted as expected. And btw, I didn't get this error message yesterday. It was a regular webpage with an error message. This is a page long popup window with red text.

So somehow, adding a comment triggers a different error message than submitting a report. And I don't know how to get rid of it, so I can post the comment.

I've tried refreshing the page (after changing about:config setting), and even browsing to it in a fresh new window. But no fix. I changed the referrer header setting from zero to 1. Is there another number I'm supposed to use?

Thanks for your help :-)

PS -- Let me know if you'd like me to post the text of the popup window. This is the current Firefox, on Win7, 64-bit.

Edit -- Now see, this report posted just fine! But I won't be able to add a comment.