Private Browsing doesn't respect themes for window header and new tab page

So I just updated to the newest version of Firefox today as of 10-5-26. Except that the purple new tab screen and header for private browsing windows that I really quite liked is not only gone, but the color that's replaced such is nearly black, making it not only much harder to see anything, but overall far worse to look at. Even worse, it doesn't change from such hardly at all regardless of theme, preventing me from correcting it. I've attached a copy of the previous version of the new tab screen for private browsing that I managed to find for reference purposes, although such doesn't have the header included. I would also like to take the time say that I've used Firefox for more than a decade, and I think because I haven't had an issue that's been remotely this bad to warrant creating an account to report such says something about how well Firefox has been working for me.