You can probably get something like chrome using "Hide Caption Titlebar Plus" (https://addons.mozilla.org/de/firefox/addon/hide-caption-titlebar-plus-sma/ https

You can probably get something like chrome using "Hide Caption Titlebar Plus" (https://addons.mozilla.org/de/firefox/addon/hide-caption-titlebar-plus-sma/ https://addons.mozilla.org/de/firefox/addon/hide-caption-tit...) to hide the titlebar and put the windows button directly into the window. You can even use Stylish to customize those button (so they'll fit your theme).