Trap [tab] in compose mode on Chrome, and prevent right-click menu on Firefox.
.

Reference: /n/atom/patch/applied/9wd-mousekbdtrap
Date: Fri May 23 21:34:33 CES 2014
Signed-off-by: root@davidrhoskin.com

--- /usr/web/9wd/js/init.js	Fri May 23 21:33:24 2014
+++ /usr/web/9wd/js/init.js	Fri May 23 21:33:25 2014
@@ -58,8 +58,14 @@
 	setevent(window, "keyup", function(e){
 		return cons.handlekeys(e, cons.kbd.up);
 	});
-
+	setevent(webdraw, "contextmenu", function(e){
+		e.preventDefault();
+		e.stopPropagation();
+		return false;
+	});
 	setevent(webdraw, "click", function(e){
+		e.preventDefault();
+		e.stopPropagation();
 		if(
 			document.pointerLockElement !== webdraw &&
 			document.mozPointerLockElement !== webdraw &&
@@ -72,7 +78,7 @@
 			webdraw.requestPointerLock();
 			return false;
 		}else{
-			return true;
+			return false;
 		}
 	});
 }
--- /usr/web/9wd/js/cons.js	Fri May 23 21:33:28 2014
+++ /usr/web/9wd/js/cons.js	Fri May 23 21:33:30 2014
@@ -49,7 +49,9 @@
 
 		if(dir == cons.kbd.down){
 			/* XXX control characters should break compose mode! */
-			if(compose.getmode()) return 0;
+			if(compose.getmode())
+				if(this.key2str(e) == "")
+					return 0;
 
 			var s =  this.key2str(e);
 			if(s == "") return 1;