Edit: It also merges the file/tools/help bar in the left button.
Edit: It also merges the file/tools/help bar in the left button.
https://addons.mozilla.org/en-US/firefox/addon/movable-firef...
Screenshot: http://inst.eecs.berkeley.edu/~tikhon/browsers.png
[1]: http://inst.eecs.berkeley.edu/~tikhon/browsers1.png
On the other hand, Firefox looks more native--for example, it has the same reload button (but not the forward/backwards buttons, for some reason) as KDE programs.
Also, unlike Chrome, it is pretty trivial to turn off the url bar, saving even more space.
However, my real point is that getting a fairly minimal firefox/chrome (although not as minimal as the example alexis-d gives) on Linux is easy and can, in fact, be done even without any extensions. You could even use KDE's tabbed windows and eschew Firefox-specific tabs entirely, but turning the tabs off in Firefox may require an extension.
Of course, a meta-point is that tinkering around with my window manager is fun :)