[Bug 20215] New: Extra mouse buttons do not work in Firefox

http://bugs.winehq.org/show_bug.cgi?id=20215

Summary: Extra mouse buttons do not work in Firefox
           Product: Wine
           Version: 1.1.30
          Platform: PC-x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

When running firefox under Wine, the extra mouse buttons on my mouse (the
"thumb" buttons) do nothing.

When using firefox under Windows or under Linux, the buttons act as a forward -
back button, but not when it's running under Wine.

I am sure this is not an modmap issue, as the buttons do work with some other
applications in Wine (SWAT4 for instance). The buttons do not seem to generate
any event to the application.