As an update to this, the more I look into the issue the more I'm suspecting that Firefox is detecting my system/monitor color profile to be bogus.

I "pass" tests such as:

http://www.gballard.net/firefox/# http://cameratico.com/tools/web-browser-color-management-test/

But the issue is that images do not always match what I can see in other color-managed applications (such as Photoshop). The only thing I can think of to explain this is that Firefox is reading embedded ICC profiles appropriately, and if set to, will assign untagged images an sRGB profile, and then when it tries to convert to monitor RGB says "Hey this is a bogus profile, using sRGB as monitor RGB instead..."

Can someone tell me, does this sound plausible? Is there a way for me to tell if Firefox is actually utilizing my monitor RGB profile?

I tried calibrating a laptop display once; not a good experience. But I digress.

You are correct that by default, Firefox will only try to color manage tagged images. There are several hidden preferences you could check/experiment with:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste gfx.c and pause while the list is filtered

gfx.color_management.display_profile - if Firefox is not using your monitor profile you can enter the path to it here - you may need to exit Firefox and start it up again for a change to this preference to take effect

gfx.color_management.mode - governs application of color management to images

0 = off 1 = on for ALL images 2 = on for TAGGED images (default)

gfx.color_management.rendering_intent - whether Firefox honors or overrides the intent flag in the ICC profile, by default, overrides to Perceptual

For details, see: https://developer.mozilla.org/Firefox/Releases/3.5/ICC_color_correction_in_Firefox

gfx.color_management.enablev4 - double-click to toggle to true if you are using an ICC v4 profile

Can you find a combination of settings that does what you want?

I am not able to rectify the issue I'm experiencing with any combination of about:config color management options. The issue is not that Firefox is utterly ignoring any attempts at color management. It will utilize embedded ICC profiles, and will assume sRGB for untagged images if gfx.color_management.mode is set to 1 appropriately. The issue, however, is that despite it managing these profiles - they do not look exactly accurate, because they are not then utilizing my monitor profile thereafter.

The flow, assuming color management is enabled for Firefox, to my knowledge is supposed to be:

Acknowledge tagged images and utilize their embedded profiles (if color_management.mode set to 2 > Convert to Monitor RGB utilizing color_management.rendering_intent > Rejoice in seeing accurate color for your screen (assuming a properly calibrated/profiled system).

The issue I'm having is that it seems the second step is failing, as it does not seem to be using my monitor profile at all. I am wondering if Firefox is detecting my monitor profile to be faulty/corrupted/otherwise bogus, because I believe then it will simply assume an sRGB profile for the monitor. Which would be fine, except that sRGB will almost certainly not be an accurate color profile to use for one's system - a properly calibrated display will have a custom profile that should be used instead.

I have tried pointing Firefox to my specific monitor/system profile via the gfx.color_management.display_profile config, and this does not rectify the issue.

This may be more a developer question - but I'm really wondering, is there a way to tell if Firefox is viewing my monitor profile to be "valid"?

Thank you for the response, I appreciate the help.

Linguini said

I am wondering if Firefox is detecting my monitor profile to be faulty/corrupted/otherwise bogus, because I believe then it will simply assume an sRGB profile for the monitor.

There is a section of the code that examines the profile to make sure it is not "bogus" but the math here is beyond me and I'm not sure whether there is a way to detect what Firefox decides:

• Call to function: https://dxr.mozilla.org/mozilla-central/source/gfx/thebes/gfxPlatform.cpp#1857

• Function: https://dxr.mozilla.org/mozilla-central/source/gfx/qcms/iccread.c#272

If you search around discussion forums oriented toward graphics/photography professionals, perhaps you can find similar reports and workarounds/solutions that don't require understanding the code. (I hope!)

Hrmm, well, the issue definitely does seem to be that it's simply not successfully converting images to my monitor RGB profile - even though it is using the embedded ICC profiles without issue.

All of my images in Firefox show up identically to how they show up in something like Opera, which utilizes color management, but does not consider your monitor profile in its solution.

That being said, according to that code you've linked to, Firefox's handling of color profiles for one's system - and determining whether or not they're "bogus", should be similar to Adobe's if not more lenient, and Photoshop is utilizing my monitor profile without any issues whatsoever. I've compared the math in the function you linked to with the values in my color profile, and I see nothing that would cause alarm based on that code. Of course, code is not my forte, so I could be missing something.

I can only assume at the moment that the issue is something to do with Firefox, or the rest of that code that makes all sorts of references I'm no familiar with.

I guess I will try to generate additional color profiles over the next several days, and see if any of them do wind up working.

Thanks again.

Upon doing some additional research, I've come to the conclusion that Firefox is having issue with table-based color profiles (rather than matrix profiles). Did some reading and reportedly there was some work done to support LUT based profiles, though some say you need to have gfx.color_management.enablev4 enabled (I've tried it with or without, no dice either way), but Firefox still seems to not work properly with all of them. Other color managed applications (Photoshop, Window's photo gallery in Windows 7) seem to work without any problems.

I copied my wife's matrix based RGB monitor profile onto my computer, and as soon as I set that to my default and relogged in, Firefox was showing things consistent with Photoshop.

Bit of a bummer but at least it's something. Definitely seems to be on Firefox's end, not handling certain table based profiles correctly. I guess I'll recalibrate and generate a matrix profile for this system over the next few days in an attempt to fix the issue.

Thank you for reporting back. If a lot of users want a feature supported, there would be some hope of getting it on the agenda or further up the agenda. You can submit feedback here:

https://input.mozilla.org/feedback

If you spend time on forums of other Firefox + calibration users, have them submit feedback, too.