User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 I have messages imported from Outlook in which the To:, CC: and BCC: lines consist of a list of addresses separated by semicolons and spaces, no commas or new lines. These lists of addresses do not wrap on to new lines, which happens with regular comma separated lists of addresses. In fact Mozilla seems to treat the entire line as a single address. So the mail window pane expands in width as far as possible to fit the address list on a single line. But as very often the address list is still too long (the 25% width expansion is insufficient), the window expansion is in vain and has highly inconvenient results e.g. in the top right pane I can see only subjects listed, and in the bottom right pane much of the text and the scroll bar disappears; and the left pane becomes so narrow that it is unusable. In short, the message is unviewable (so this is not a minor bug). The first time I got this I thought the situation was unrecoverable, but fortunately Mozilla returns to normal when I click on a message in the top right pane which doesn't have a long address line. Reproducible: Always Steps to Reproduce: 1. Find or compose a message with a To: line consisting of many addresses, several hundred characters, separated by semicolons and spaces but no commas or new lines 2. Click on it Actual Results: Mozilla attempts to display the address list on one line. Right hand panes expanded as far to the left as possible, left pane becomes so narrow as to be useless. Also they expand to the right off the screen and so much of their contents becomes invisible and inaccessible. Expected Results: Wrapped the address list on to multiple lines, either after a semicolon or at any space. Not resized the windows. Such window resizing should probably never be attempted anyway especially when the results are still too big for the screen - better alternatives are wrapping on to new line (at any character if necessary) and adding horizontal scroll bars. You may say that it is illegal to have mail addresses separated by semicolons. That means the bug is elsewhere, in the Outlook mail import procedure, which generates addresses in this format. Even so, I would suggest that Mozilla ought to do something more sensible even when it is given bad data to display.

This looks like a duplicate of bug 91662

Agreed on the dupe. *** This bug has been marked as a duplicate of 91662 ***