As of today, the forum software processes posts from Firefox incorrectly. The version of Firefox is recent, but did not change in the last day.
Previously, posts from Firefox would often add spurious line feeds (gaps between paragraphs) which could be subsequently edited out. But as of today, the forum software does not recognize line breaks at all, even if issued multiple times. Also, it does not recognize commands to do such things as italics. And, it substitutes HTML Entities for some things such as quotes.
I switched to Chrome for this message, but I don’t normally use Chrome, due to privacy issues on a shared computer.