User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 Build Identifier: 3.1.10 (basically all version 3 I have had) When writing a new email the font changes to variable width when you use the End key or the right arrow keys to go to the end of the last line of the body of the email. The cursor must go back at least one character or line and then you must go to the last character on the last line. Reproducible: Always Steps to Reproduce: 1. Write a new email message. My default font is Garamond, but I believe it works with all fonts. 2. In the body, type characters. 3. With the left arrow key, go back at least one character (like you misstyped and need to correct a character). 4. With the cursor on the bottom line of your message, go to the end of the line either by hitting the "End" key or using the right arrow. 5. The font will change from your default to "variable width" and a different font, Arial, I think. Actual Results: Bugzilla website font will not reproduce the problem. Expected Results: Font doesn't change. This started with version 3.0. 2.0 did not have this problem. I have seen this listed in the forums, but it doesn't seem that Mozilla people care enough about the problem.