Hello, My question is the following. As the following album shows: <a href="http://imageshack.us/g/1/9925545/">http://imageshack.us/g/1/9925545/</a> In Lubuntu, it is possible to hide the system bar on top when using Chrome/Chromium and Opera (in Opera, the default theme doesn't allow to do that, but I installed one of the Opera Themes in the official page and they allow to hide the system bar). However, in Firefox this is not possible. Three years ago, when I was using Ubuntu 9.10, I needed to use compiz to do that, but actually it wasn't a satisfactory solution, because there was an option to hide the menu bar, but the new window didn't have the close, minimize and maximize buttons. In other words, at that time I couldn't found a solution. And of course, the option of hiding the menu bar for all programs is not satisfactory either, for the same reason (being able to see the buttons). Is there a workaround that might work specifically for Firefox, like the ones in Opera and Chrome? In Opera, this was not possible until the recent Opera 12, perhaps in Firefox there have been some progress in this area. Thanks for your attention