Hi,

since a recent update (of fvwm, Firefox, or Xorg),
some fvwm-mouse-bindings break Website-menus in Firefox on Linux.
It worked fine previously.

Details:
- Fvwm-configuration:
  I used Super_L + left mouse-button to move/raise/lower windows,
  which is really handy:

  Mouse 0  W  4  move-and-raise-or-raiselower
  DestroyFunc move-and-raise-or-raiselower
  AddToFunc   move-and-raise-or-raiselower
  + "M" Move
  + "M" Raise
  + "C" RaiseLower

- Website menus:
  Many websites use menus, which open on mouse-hover. Then, you have
  to click on a menu item, and the link of the menu item opens.
  Minimal example:
  https://www.simple-is-better.org/firefox-dropdown-bug/
  Correct behaviour: Click on A/B/C should result in a opening
  a.html/b.html/c.html with e.g. "Success: A".

- Since a recent update, I cannot open any menu item anymore.
  When I click on a menu item, instead of opening the menu-item-link,
  the menu is only closed (and a link behind the menu is activated,
  if there is any).

  If I remove the mouse-binding, it works again.

It happens both in fvwm2 and fvwm3, and at least with all Firefox >=120.
Is this a known issue, and is there any fix/workaround?

Versions:
- fvwm3 1.0.8 / fvwm 2.7.0
- Firefox: 123.0 and others
- X.Org X Server 1.21.1.11
- Linux, NixOS 23.11


Best regards
Roland


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