What It Be Like Rated 4 out of 5 stars
I found this theme when "GrayModern2" died (R.I.P.)
which I find to be a completely acceptable substitute.
I am unsure why the Mozilla team insists on ugly for the default,
and most developers create themes which distract.
The only thing preventing me from contributing
is the delay on updates between FireFox releases;
that being said,
if more of us contributed,
possibly the developer would be more timely...
FYI: AshleyJ's suggestion does not apply to FF18 or the version of Silvermel identified in the post.
Which may also be contributing to the delay by the developer,
updating to a stable version release may be a bit more effort in this instance.
in the words of a true lunatic:
"In reality, the only constant is change" ~mm