I'm seeing a weird problem with trying to use current Firefox Nightly
builds under my FVWM configuration, where some of Firefox's menus won't
appear (or won't appear consistently). This seems specific to using
Firefox under FVWM; under another window manager (Cinnamon) things work.
Old Firefox Nightly builds worked fine, so something has changed in what
Firefox is doing (which means the issue might be in Firefox or in FVWM).
I thought I had a consistent and simple reproduction but it turns out
that I don't (it's consistent but not entirely simple). Is there any
debugging stuff that I should try in FVWM to narrow down what's going
on? Are people interested in a somewhat complex reproduction?
- cks
