While I was evaluating 3 photosharing services (Flickr, SmugMug and Zenfolio) I noticed that the images on Zenfolio looked very dark compared to the images on Flickr andSmugMug.   This problem only existed while unsing Firefox as my browser.  The images were shown properly when using Google Chrome, etc.  See the example below:

After it was posted on Twitter I got the following response from @wendyalas:  @n8uir that’s because yours is probably turned off. try this http://bit.ly/1sbFNM

This did not apply to version 3.5 but it did lead me to THIS and I was able to get it working properly.  I had to disable the Color Management.  Now, all the images on all 3 services look the same.  Now I just need to figure out which one is the best service for me.