add: catMan.deleteCategoryEntry("command-line-handler", "m-edit", true); 
context:   unregisterSelf: function (compMgr, location, type) {    var compReg = compMgr.QueryInterface(nsIComponentRegistrar);    compReg.unregisterFactoryLocation(nsComposerCmdLineHandler_CID,                                      location);    var catMan = Components.classes["@mozilla.org/categorymanager;1"].getService(nsICategoryManager);    catMan.deleteCategoryEntry("command-line-argument-handlers",                               "nsComposerCmdLineHandler", true);  },    
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/dd21fbbc651dcecfe6a25f831a4a9a2c765f7055/nsComposerCmdLineHandler.js/buggy/editor/ui/nsComposerCmdLineHandler.js