As I was debugging today I noticed that we keep doing InvalidateCacheSubtree() calls as the XUL document loads. That's a lot of extra unnecessary cache invalidations and events firing. Apparently we act as if the XUL document is loaded as soon as its nsDocAccessible is created. I'm not sure why we need to do that -- there is no comment. I made that change here, but unfortunately I forgot to put the bug # in the checkin comment: 1.78 <aaronleventhal@moonset.net> 2005-09-30 12:23 Context menus don't work with screen readers starting on 09/21. r=parente, sr=bryner

Ah, it was for bug 310350 The patch description says "1) Mark chrome docs as loaded so that mutation handling works" The code that does that was added here: http://lxr.mozilla.org/seamonkey/source/accessible/src/base/nsDocAccessible.cpp#110 Not sure if we still need it for mutation handling to work in XUL.