In brief, that bug deals with opening new tabs in Private mode. A white flash is seen before the purple background takes over.
I noticed something similar on some pages using the non-Private mode as well because I use a dark style to view web content.
On a chance, I used a solution posted years ago by Bozz: http://forums.mozillazine.org/viewtopic ... #p10416257
Code: Select all
tabbrowser tabpanels {
background-color: #your choice !important;
}
Editing in the hope of getting the Firefox user agent string to show! Hmm... doesn't work