STABLE version -- 5.0.1002.354

[Perfect_Stranger]

Can you make a screenshot to show that?
Not sure what is the "loading background".

The background color in the time interval from browser launch to the appearance of the specified page. This is also called the strobe effect. On Firefox, I use the following code to change the background color:

Code:

#tabbrowser-tabpanels {background: #211400 !important}