[Bug 40599] New: Firefox : Menu bar or tabs hidden by window manager (kwin)

https://bugs.winehq.org/show_bug.cgi?id=40599

Bug ID: 40599
           Summary: Firefox : Menu bar or tabs hidden by window manager
                    (kwin)
           Product: Wine
           Version: 1.9.9
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 54445
  --> https://bugs.winehq.org/attachment.cgi?id=54445
wine_firefox_with_menu_bar

With firefox esr (v 38.8 as a portableapp) if the menu bar (File, edition...)
is not displayed, part of the tabs is hidden by my window manager (kwin under
kde).
There are 2 cases : when window is maximized, then part of the tab is hidden,
when the window is "restored" then display is acceptable

If I enable the menu bar (menu view/toolbars/menu bar, I get there by doing
ALT+F, and then navigate with keyboard and mouse), then the menu bar is not
visible.

See screenshots