CSS - :-moz-lwtheme
The :-moz-lwtheme pseudo-class matches in chrome documents when the root element's lightweightthemes attribute is true and a theme is selected.
Description
The :-moz-lwtheme pseudo-class matches in chrome documents when the root element's lightweightthemes attribute is true and a theme is selected.
See Also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/css/:-moz-lwtheme