Remove old try...catch for old FF

src/ajax/xhr.js

@@ -90,59 +90,49 @@ if ( xhrSupported ) {
 					callback = function( _, isAbort ) {
 						var status, statusText, responses;
 
-						// Firefox throws exceptions when accessing properties
-						// of an xhr when a network error occurred
-						// http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
-						try {
-
-							// Was never called and is aborted or complete
-							if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
-								// Clean up
-								delete xhrCallbacks[ id ];
-								callback = undefined;
-								xhr.onreadystatechange = jQuery.noop;
-
-								// Abort manually if needed
-								if ( isAbort ) {
-									if ( xhr.readyState !== 4 ) {
-										xhr.abort();
-									}
-								} else {
-									responses = {};
-									status = xhr.status;
-
-									// Support: IE<10
-									// Accessing binary-data responseText throws an exception
-									// (#11426)
-									if ( typeof xhr.responseText === "string" ) {
-										responses.text = xhr.responseText;
-									}
-
-									// Firefox throws an exception when accessing
-									// statusText for faulty cross-domain requests
-									try {
-										statusText = xhr.statusText;
-									} catch( e ) {
-										// We normalize with Webkit giving an empty statusText
-										statusText = "";
-									}
-
-									// Filter status for non standard behaviors
-
-									// If the request is local and we have data: assume a success
-									// (success with no data won't get notified, that's the best we
-									// can do given current implementations)
-									if ( !status && options.isLocal && !options.crossDomain ) {
-										status = responses.text ? 200 : 404;
-									// IE - #1450: sometimes returns 1223 when it should be 204
-									} else if ( status === 1223 ) {
-										status = 204;
-									}
+						// Was never called and is aborted or complete
+						if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
+							// Clean up
+							delete xhrCallbacks[ id ];
+							callback = undefined;
+							xhr.onreadystatechange = jQuery.noop;
+
+							// Abort manually if needed
+							if ( isAbort ) {
+								if ( xhr.readyState !== 4 ) {
+									xhr.abort();
+								}
+							} else {
+								responses = {};
+								status = xhr.status;
+
+								// Support: IE<10
+								// Accessing binary-data responseText throws an exception
+								// (#11426)
+								if ( typeof xhr.responseText === "string" ) {
+									responses.text = xhr.responseText;
+								}
+
+								// Firefox throws an exception when accessing
+								// statusText for faulty cross-domain requests
+								try {
+									statusText = xhr.statusText;
+								} catch( e ) {
+									// We normalize with Webkit giving an empty statusText
+									statusText = "";
+								}
+
+								// Filter status for non standard behaviors
+
+								// If the request is local and we have data: assume a success
+								// (success with no data won't get notified, that's the best we
+								// can do given current implementations)
+								if ( !status && options.isLocal && !options.crossDomain ) {
+									status = responses.text ? 200 : 404;
+								// IE - #1450: sometimes returns 1223 when it should be 204
+								} else if ( status === 1223 ) {
+									status = 204;
 								}
-							}
-						} catch( firefoxAccessException ) {
-							if ( !isAbort ) {
-								complete( -1, firefoxAccessException );
 							}
 						}