Whatever they do to the default layout in FF doesn't bother me, just keep giving me the option to put it back the way I like it. So far, so good... other than needing a plug-in now to get a bottom status bar.
I have to move the mouse around and play dodge-the-tooltip and hope I get lucky.
FF went and added an 'Add-Ons Bar' to replace the bottom real-estate that plugins wanted to sit in lost by the status bar removal. So now, if I use the Add-on bar, AND allow the Chrome style status pop-up, I loose even more space since the URL is now outside the bottom bar, and I'm left with a ton of unused space on the Add-on bar. FF should have just made the Status label a movable element and allowed it to go back in the bottom bar if desired. Since the bar is going to be there anyhow for some people with plugins then their effort to save UI space just cost me 2x the UI space. It frustrates me that what could have been a simple and flexible change (optional, draggable status label) has turned into a hodge podge of work-arounds.
However the Chrome pop-up has a tendency to obscure useful page content, especially on (oh, irony) Google docs.
I much prefer a devoted status bar. OTOH, I have a WUXGA screen (1920x1200) so I have less need to obsess over vertical screen space.
The rise of so-called "HD" screens is one of the tragedies of modern computing that ranks up there with Comic Sans.