Merge pull request #15016 from davidflanagan/bug951920

Bug 951920: fix visuals for alternative character popups r=rudylu(cherry picked from commit 3d27ec08f47652d181f9653366143adc772c84bd)
Merge pull request #15095 from davidflanagan/bug951920v1.3

Merge pull request #15016 from davidflanagan/bug951920