British Summer Time

Activating P3 color gamut in Firefox on a Mac

There are three about:config settings you need to set:

gfx.color_management.display_profile = /System/Library/ColorSync/Profiles/Display P3.icc
gfx.color_management.mode = 1
gfx.color_management.native_srgb = false

You can read this Mozilla support article if you are new to about:config:

https://support.mozilla.org/en-US/kb/about-config-editor-firefox

NOTE: this mightwill mess up the colours in your canvas