User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 When only the charactors "--" (without quotes) are on a line in a message, successive lines appear "greyed out" until another line starts with another "non-alphabet" charactor such as ">". Reproducible: Always Steps to Reproduce: 1.create message wih only "--" on a line in the message and send it, read w/ff - text following the line "--"will be faded out 2.edit the message in the inbox file and add an additional "-" to the line 3.now when read, all of message text is same intensity Actual Results: indicates ff is using the "--" as a command to change font Expected Results: ff is set up to display only plain text, it is clearly not doing this. I have tried every possible configuration and cannot remove this behavior.

dash dash space (that is, "-- ") is the convention for marking a signature; what you are seeing is by design. One related bug is bug 54570, about the signature detection algorithm handling some cases poorly.

*** This bug has been marked as a duplicate of 54570 ***