Right now pdf.js ignores embedded color profiles of any kind.
Here's a test pdf that looks just fine with Windows Reader on Windows 8, but shows no support in PDF.js.
And yes, Firefox does work (same test, but as html: http://www.color.org/version4html.xalter)
13xforever
All 9 comments
Details:
firefox 21.0a2 (2013-02-28)
pdf.js version 0.7.256
screenshot: 
13xforever
on 1 Mar 2013
The HTML site shows version 2 support only in here (windows 7 x64, firefox aurora), is this something new to windows 8?
gigaherz
on 1 Mar 2013
SumatraPDF doesn't support those profiles either, so I wonder how important the support really is?
gigaherz
on 1 Mar 2013
ICCv4 is disabled by default in Firefox, you have to flip gfx.color_management.enablev4 to True
13xforever
on 1 Mar 2013
I don't know how important it is, but I couldn't find any relevant bug, so I made a new one with links to test cases.
13xforever
on 1 Mar 2013
Yeah it's okay, better to have a tracking bug. Worst case the devs would close as "won't fix", best case it gives some dev or contributor something to do ;P
gigaherz
on 1 Mar 2013
I don't know if it works, but if it can help someone to implement ICC profiles, I found this:
https://formats.kaitai.io/icc_4/javascript.html
It seems to be CC0 license, it may be a start to begin ICC profiles support.
SamyCookie
on 17 Sep 2018
Frankly it's a bit ridiculous that Firefox's PDF viewer (PDF.js) still lacks support for both v2 and v4 profiles in the year 2020. 馃槧 馃憥
SumatraPeter
on 7 Feb 2020
Seems that even Chrome doesn't support v4 profile.
nvmnghia
on 1 May 2020
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Most helpful comment
Frankly it's a bit ridiculous that Firefox's PDF viewer (PDF.js) still lacks support for both v2 and v4 profiles in the year 2020. 馃槧 馃憥