Thanks for the tips guys.
I was able to do it by:
1) Uninstalling Firefox Flash player
(https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html).
2) Install NPAPI debugger.
3) On Firefox, go to "Open menu -> Add-ons -> Shockwave Flash (click
'Options' or 'More')" and then *u
I cannot debug after installing the debuggers (version 31).
I looks like firefox has disabled npapi and edge has it sandboxed.. I saw a
topic in microsoft where the support says it is impossible to debug in it
right now.. same thing in chrome.. I am using windows 10 and the most
updated browsers
