* attempt to set our WndProc on Moz windows
* store window Id as a string
Calling CallWindowProc or ctypes.FuncType from a WNDPROC added to a Firefox
window crashes. See
https://bugzilla.mozilla.org/show_bug.cgi?id=598679https://bugzilla.mozilla.org/show_bug.cgi?id=671266
The problem does not seem to occur on non-Firefox windows (for ex. a a hidden
window that we created).
We'll try to test Hooks instead of WndProcs.