Issue with images displaying too dark with Zen and Firefox

[philippegm]

Hi

I'm having an issue with image display on certain sites, like Glazy.org, when using Zenbrowser.
The images appear very dark.
The problem isn't with the site itself, as it displays normally in Chrome or Brave.
I don't know how to fix this issue, which seems to stem from Zenbrowser and Firefox.
Can anyone help?

Thank you

[hoangperry]

This looks like Firefox's color management mishandling the images' embedded ICC profiles — Chrome/Brave are more forgiving with unusual profiles, which is why the same images look fine there. Glazy specifically hosts user-uploaded photos that often carry odd or broken profiles, so it's a common site for this to surface. Since Zen is Firefox-based, it inherits the behavior.

To confirm and fix:

1. Open about:config in Zen.
2. Find gfx.color_management.mode. Default is 2 (color-manage only tagged images). Set it to 0 (off) and fully restart the browser.
3. If the images now look right, it was profile handling. You can either leave it off, or try the middle ground: mode 2 with gfx.color_management.enablev4 set to true (better handling of v4 ICC profiles, which are a frequent cause of "dark image" rendering).
4. Also check whether your OS has a display ICC profile applied (Linux color settings, judging by the screenshot) — a miscalibrated display profile combined with Firefox's color management multiplies the darkening; testing with mode 0 isolates which side it is.

If mode 0 does not change anything, the next suspect is GPU compositing rather than color management — test with hardware acceleration toggled off once (gfx.webrender.software → true, restart) to rule that out, then flip it back.

[philippegm]

Ok hoangperry, Thank you

gfx.color_management.mode. Default is 2 (color-manage only tagged images). Set it to 0 > Work well

gfx.color_management.mode. Default is 2 and gfx.color_management.enablev4 set to true > No change