ui.textSelectBackground saves the color in which the background of a text selection in the user interface or in content will be styled.

• Type:string with RGB hex value as color code
• Default value:#EF0FFF (blue) [1]
• Exists by default: no
• Application support: before Gecko 1.7
• Status: Active; last updated 2015-09-21
• Introduction: Pushed to trunk on 2000-04-13
• Bugs: bug 34704 

[1]: nsXPLookAndFeel.cpp, line 628, retrieved 2015-09-21