Excelent open source addon. Followed suggestions from https://github.com/m-khvoinitsky/dark-background-light-text-extension/issues/222 and tweaked global color from hard dark to softer:
Default foreground color: #B0B0B0 Default background color: #303030 Default link color: #7777ee Default visited link color: #663e8b Default active link color: #A03333 Default selection color: #ffd38c
