Yes I use a minus1 (-1) for rendering intent, so firefox will only render intents embedded in the photo. I did not want firefox render my images in a different way than I intended.

Rendering Intent can also be:-
0 = Perceptual. Directs Firefox to render the image to preserve detail throughout the tonal range of the image. Useful for general purpose display of images in typical cases, especially for photographs and other pictures.
1 = Media-relative colorimetric. This rescales the color spectrum so that the white point of the rendering medium (such as the display screen) is mapped to the white point of the reference medium. This is most useful for colors that have been mapped to a medium with a smaller gamut than the reference medium.
2 = Saturation. This preserves vividness of color at the expense of preservation of precision of hue. This is particularly useful for charts and diagrams, and other media whose colors should “pop” while precise duplication of hue is less important.
3 = ICC-Absolute colorimetric. This is most useful for spot color and when simulating one medium on another, as it doesn’t alter in-gamut colors.

Note: In Firefox 3.5, perceptual, media-relative, and saturation intents all render the same way.

See https://developer.mozilla.org/En/ICC_color_correction_in_Firefox for more details on the browser settings.

Rendering intent is a different thing to the test images on color.org. Rendering intent is how the different levels of colour tonal range are mapped between different profiles. The images of the on http://www.color.org/version4html.xalter were designed to show if color management was enabled, and your browser could show different profiles. Recently v4 e-sRGB and v4 YCC-RGB color profiles were disabled in the Safari browser, and I am guessing Firefox also.

Regards

Carl

Is that a MINUS 1 after rendering intent?

I tried your settings and they did not work for me.

FF v.3.5.2, viewing, http://www.color.org/version4html.xalter