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I have a user who needs to show all of the email address in Thunderbird without having to click the "show triangle"!

To explain:- I have screenshotted before clicking the show triangle and after (email addresses removed to protect the innocent). As you can see the second line of email addresses are hidden.

I imagine there is a setting in about:config, but I have yet to find it!

enter image description here

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up vote 1 down vote accepted

Someone did find a hack to enable something like this, but it seems like it could be more hassle than it's worth (and may not even work in the latest versions).

See this thread:

You may want to add this as an idea at if it's not already there.

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mail.showCondensedAddresses is the one

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No it isn't - it alters the display name of the person - nothing at all to do with showing all email addresses. See – Jon Rhoades Oct 12 '09 at 4:46
@blanx: Your answer might be the wrong one for this question, but was the right one for what I wanted to do. Thanks. – Mike L. Feb 16 '11 at 13:38

Since Thunderbird 3.1.3 (circa 2010), the following property allows you to choose the default number of address lines shown before "more" appears:


When equal to 0 all lines are shown. It defaults to 1. (Reference.)

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This worked for me in Thunderbird 31.4.0. – kmoser Jan 15 '15 at 17:39

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