When you pin an app tab, most of the time there's no need to navigate with it. So this gives you more of a browsing view.
Now you wont have to worry about all that extra junk and you'll be able to see more of that site you pined.
AppTabs - AddonStyled will hide the following
- back, forward, home buttons along with the URL bar (this is known as the navigation toolbar)
- your bookmarks bar
- and any other toolbars you may have
leaving only the FF menu and your tabs. Just like your window appears when you open the add-ons manager.
NOTE: this has benn tested on windows 7, XP, and linux (not sure what build). If anyone could test this on a mac i would appreciate it.