Such changes include the inability to edit any of the UI except a row of buttons on the top left, shockingly just like chrome!. I'm sure these changes will help focus their design vision, or something.

So in short, no, you wont be able to configure your client to look exactly like it did before.

Just as in Sublime Text (and even with a proper titlebar), I really dislike those Chrome-y tabs. They take too much real estate for my taste.

Lion scrollbars finally landed on Aurora and I was hoping to move back to Firefox again when it would land in Beta. The move towards consistency with the platform was very welcome around Fx4. Now, striving for uniformity, they make it feel foreign again.

Here's the agenda: Firefox as a brand has to grow and make a show of itself. Indeed the Chromification goes much deeper than simply tab looks: as the OS is relegated to a platform/hypervisor, the browser becomes an OS in itself, so that Firefox OS makes sense for people. They're moving to make phones, which will soon call for services (unless they plan to rely solely on third parties such as WhatsApp). Mozilla's product may increasingly end up looking like yet another vertically integrated software platform.