ui.SpellCheckerUnderline holds the colour which is used to underline words not recognized by the spellchecker.

• Type:string
• Default value:#ff0000
• Exists by default: no
• Application support: Gecko 1.9.2 (Firefox 3.6 / Thunderbird 3.1 / Fennec 1.0)
• Status: Active; last updated 2012-02-21
• Introduction: Pushed to Nightly on 2009-04-03
• Bugs: bug 338209 

Values

A color code like #ff0000 for red.