The latest version of Firefox (official 3.5 and BETA 3.6 versions) can support colour managed profiles for those of you who have:
A) Wide gamut monitors (such as the HP L2475W). B) Colour calibrated monitors.
To enable or check what the mode is currently set to simply type "about:config" into your address bar without the quotes and do a search for "gfx.color"
On the entry "gfx.color.mode" will probably be a number value, the default should be 2 but you can customise this with:
0 = Color management is disabled for everything 1 = Color management is enabled for all rendered graphics including untagged images which will assume sRGB 2 = Color management is enabled for all rendered graphics except untagged images which are left unmanaged.
If web images on FlickR/DeviantART and other photo based sites were looking too bland and washed out then the above may help resolve this.
Anyone wishing to colour calibrate (I highly recommend it as the results are excellent) then should look at the XRite EyeOne Display2 colorimeter which will cost around £120. The bundled software is good but you can also use Lacie Blue Eye Pro which is more robust and gives more accurate calibrations.