The firefox dev tools can inspect a page's CSS and display the css that is applying on a selected element.
However, in some sites, there are tons of
-webkit- invalid properties, that keep cluttering everything. DevTools even graciously place some yellow ! triangles on some of them, adding even more clutter to the screen.
Good old firebug (may it honorably rest on EEE merger graveyard) removed those invalid properties from sight.
Is there a way to hide those instead of displaying the strikethrough'ed text?