Created attachment 8908856 [details] Firefox 57 "red" tab User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170816210634 Steps to reproduce: 1.) Go to manage containers 2.) Create a new container type or change an already existing type to use the reddish color. 3.) Open a tab of that particular container. Actual results: Note that the color is nearly identical to the orange used at the top of all Firefox's tabs. Expected results: The color should be different. In Firefox 55 the color is red. This is a very minor issue, but it should be changed back to red so as to not be the same as the color at the top of the tab (plus, there is already an orange one).
This appears to be a deliberate change from bug 1387003.