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!

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2 Answers 2


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: http://forums.mozillazine.org/viewtopic.php?f=39&t=546398

You may want to add this as an idea at http://getsatisfaction.com/mozilla_messaging if it's not already there.


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.)

  • 2
    This worked for me in Thunderbird 31.4.0.
    – kmoser
    Jan 15, 2015 at 17:39
  • Still works in Thunderbird 102. Thanks!
    – Ian Dunn
    Dec 3, 2022 at 18:20

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