Paint Flashing in Firefox Nightly
Yesterday I landed a new feature in the Firefox DevTools: paint flashing. What it does is to highlight areas being painted by Gecko. Avoiding useless painting operations can help you to build more performant web pages.
Note for Firefox developers:
nglayout.debug.paint_flashing still works, but I encourage you
to try the
If you turn on the pref
you can type the command (shift-F2 to bring the command line)
paintflashing on --chrome to enable paint flashing
only for the chrome (the
--chrome option is not available
if you don't turn on this pref).
I introduced a new property to
Setting it to true will turn on paint flashing for the specified window, and to false will
clear the colors and stop paint flashing.