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Thunderbird UI font size on HighDPI

I cannot figure out how to increase the menu font size or the message list font size in Thunderbird. I've tried:

  1. Increasing the font sizes in Thunderbird preferences (no effect on anything)
  2. Setting a minimum font size of 20 in Thunderbird preferences (no effect on anything)
  3. Setting the layout.css.devPixelsPerPx in about:config to 2 (only affects mail bodies, and not much else)
  4. Setting the X font DPI in .Xresources (no effect on anything)
  5. Setting the font size in the KDE systems settings pane for GTK (no effect on anything)
  6. Setting the font size in lxappearance (only affects lxappearance itself, not Thunderbird - and lxappearance itself resets back to normal after restarting it!)

I am using KDE on Fedora 23 and I already have KDE configured for HighDPI (although much of KDE is still broken because it uses fixed pixel sizes).