Hi Ken,
I found a duplicate report in the Mozilla "Bugzilla" website and it provides a
solution.
https://bugzilla.mozilla.org/show_bug.cgi?id=502371
To quote comment number 3:
"This may be specific to the locale based on any strings being longer than in
the en-US version. The other option may
Here is the screen shot after the change.
** Attachment added: "Layout CSS DPI - After change"
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1251059/+attachment/5163271/+files/TB_Pref_Adv_ConfigEditor_LayoutCssDpi_AfterChg.png
** Summary changed:
- Preferences dialog window
