Hello! I have two monitors and did calibration&profiling for both of them. So they have different icc color profiles. Color management in Firefox (58.0.1) is enabled with gfx.color_management.mode=1. Problem: Firefox is always using the icc color profile of the primary monitor, no matter if I move the browser window to the other monitor. That leads to correct colors only on one monitor, while the colors on the other monitor are distorted (it would be even better to use no profile at all on the other monitor compared to using the wrong one). How it should be: Firefox should at least switch to using the icc profile of the second monitor as soon as more than 50% of the browser window is moved to the other monitor. This is how Chrome for example handles it. As soon as you move enough of the Chrome window to the other monitor, the colors of both UI and website contents are refreshed and change immediately. This is sufficient because usually you don't want to split your browser window over two monitors. Though it would still be the ideal solution, if Firefox detects which part of the window is located on one and which part on the other monitor and partially applies the right icc profile (which is how professional color managed software like Photoshop does it). Is it maybe possible to achieve this already by using an extension?