I use it for the standard things like hovering over URL's and watching page load progress. And I also agree that the pop-up in Chrome works reasonably well for this too... however...
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.
We are going through a redesign for my company's web app and now we're going to have to insert a tiny bit of blank space at the bottom because Chrome's pop-up statusbar is covering a vital part of the UI! Doh!
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.