I know, I know—this project is dead but I thought it might be useful for others to report this here.
I tried including MD in an OpenFL project and am getting errors.
First as a swf (the one packaged with the monsterdebugger extern):
<library path="monsterdebugger.swf" generate="true" preload="true" if="flash debug" />
TypeError: Error #2023: Class LinkLib$ must inherit from Sprite to link to the root.
Then as a swc:
<haxeflag name="-swf-lib" value="MonsterDebugger.swc" if="flash debug" />
VerifyError: Error #1014: Class mx.core::UIComponent could not be found.
ReferenceError: Error #1074: Illegal write to read-only property com.demonsters.debugger::MonsterDebuggerUtils on global.
at global$init()[D:\Workspace\MonsterCave\Tools\MonsterDebugger\client\actionscript\classes\com\demonsters\debugger\MonsterDebuggerUtils.as:61]
ReferenceError: Error #1074: Illegal write to read-only property com.demonsters.debugger::IMonsterDebuggerConnection on global.
at global$init()[D:\Workspace\MonsterCave\Tools\MonsterDebugger\client\actionscript\classes\com\demonsters\debugger\IMonsterDebuggerConnection.as:51]
etc.
I will see if I can fix this and submit a pull request.