Separate Security Issue, please update your Flash 29.0 r0 If you use it Reinstall with Flash Player Version: 30.0.0.134 Current Version https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, . . . .)

3 Bar Menu --> Customize --> Far left bottom Title Bar, remove check mark.

If it is not there or the check mark is not there but the Title Bar still shows Will have to figure it out.

As it is a Beta anything can happen and will.

as Pkshadow said,

see the red highlight on the bottom left.

You should find a button to hide the title bar at the bottom of the Customize palette window as part of client-side-decoration support on Linux.

That controls this pref on the about:config page.

• browser.tabs.drawInTitlebar = true/false