>>Seems like correct behavior to me. If you requested specific width size, why do do expect a Browser to ignore you request? I don't think you should use absolute width size in case when you expect it to be exceeded.
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>We have to force a specific width size, as defined in the account setup, in order to allow each member the ability to control the reading width size. But, when a PRE tag is included in a message, assuming a very long line, the browser should adjust and extend the width of the tables that define the form. It works ok on other browsers I have used. It also worked on that browser in an old version. I just do not know why it doesn't on the new one.

I saw one case, and the offending lines in PRE tags included tabs. That's probably what threw the browser off - my FF3 didn't calculate the widths of tab positions properly, but used a smaller value, so the ends of the lines with tabs bled through the right edge.