diff --git a/common/content/buffer.js b/common/content/buffer.js
index ef1c2a82..3089256f 100644
--- a/common/content/buffer.js
+++ b/common/content/buffer.js
@@ -1007,7 +1007,11 @@ const Buffer = Module("buffer", {
         XPCOM([Ci.nsIWebProgressListener, Ci.nsISupportsWeakReference]), {
         init: function (doc, callback) {
             this.callback = callable(callback) ? callback :
-                function (file) editor.editFileExternally(file.path, callback, null, true);
+                function (file) {
+                    editor.editFileExternally({ file: file.path, line: callback },
+                                              function () { file.remove(false) });
+                    return true;
+                }
 
             let url = isString(doc) ? doc : doc.location.href;
             let uri = util.newURI(url, charset);
@@ -1018,8 +1022,8 @@ const Buffer = Module("buffer", {
                     let encoder = services.HtmlEncoder();
                     encoder.init(doc, "text/unicode", encoder.OutputRaw|encoder.OutputPreformatted);
                     temp.write(encoder.encodeToString(), ">");
-                    this.callback(temp);
-                }, this);
+                    return this.callback(temp);
+                }, this, true);
 
             let file = util.getFile(uri);
             if (file)
@@ -1038,10 +1042,11 @@ const Buffer = Module("buffer", {
         onStateChange: function (progress, request, flag, status) {
             if ((flag & Ci.nsIWebProgressListener.STATE_STOP) && status == 0) {
                 try {
-                    this.callback(this.file);
+                    var ok = this.callback(this.file);
                 }
                 finally {
-                    this.file.remove(false);
+                    if (ok !== true)
+                        this.file.remove(false);
                 }
             }
             return 0;
diff --git a/common/content/editor.js b/common/content/editor.js
index 386a3194..af210936 100644
--- a/common/content/editor.js
+++ b/common/content/editor.js
@@ -241,12 +241,14 @@ const Editor = Module("editor", {
         return -1;
     },
 
-    editFileExternally: function (path, line, column, async) {
-        let args = options.get("editor").format({ file: path, line: line, column: column });
+    editFileExternally: function (args, blocking) {
+        if (!isObject(args))
+            args = { file: args };
+        let args = options.get("editor").format(args);
 
         dactyl.assert(args.length >= 1, "No editor specified");
 
-        io.run(io.expandPath(args.shift()), args, !async);
+        io.run(io.expandPath(args.shift()), args, blocking);
     },
 
     // TODO: clean up with 2 functions for textboxes and currentEditor?
@@ -309,11 +311,10 @@ const Editor = Module("editor", {
                     }
                 }
 
-                let timer = services.Timer();
-                timer.initWithCallback({ notify: update }, 100, timer.TYPE_REPEATING_SLACK);
+                let timer = services.Timer(update, 100, services.Timer.TYPE_REPEATING_SLACK);
 
                 try {
-                    this.editFileExternally(tmpfile.path, line, column);
+                    this.editFileExternally({ file: tmpfile.path, line: line, column: column }, true);
                 }
                 finally {
                     timer.cancel();
diff --git a/common/content/io.js b/common/content/io.js
index e6d09e07..46464800 100644
--- a/common/content/io.js
+++ b/common/content/io.js
@@ -230,12 +230,9 @@ const IO = Module("io", {
      *
      * @param {string} program The program to run.
      * @param {string[]} args An array of arguments to pass to *program*.
-     * @param {boolean} blocking Whether to wait until the process terminates.
      */
-    blockingProcesses: [],
     run: function (program, args, blocking) {
         args = args || [];
-        blocking = !!blocking;
 
         let file;
 
@@ -274,12 +271,19 @@ lookup:
             return -1;
         }
 
-        let process = services.Process();
-
-        process.init(file);
+        let process = services.Process(file);
         process.run(false, args.map(String), args.length);
         try {
-            if (blocking)
+            if (callable(blocking))
+                var timer = services.Timer(
+                    function () {
+                        if (!process.isRunning) {
+                            timer.cancel();
+                            callback();
+                        }
+                    },
+                    100, services.Timer.TYPE_REPEATING_SLACK);
+            else if (blocking)
                 while (process.isRunning)
                     util.threadYield(false, true);
         }
@@ -453,16 +457,18 @@ lookup:
      * @returns {boolean} false if temp files couldn't be created,
      *     otherwise, the return value of *func*.
      */
-    withTempFiles: function (func, self) {
+    withTempFiles: function (func, self, checked) {
         let args = util.map(util.range(0, func.length), this.createTempFile);
         try {
             if (!args.every(util.identity))
                 return false;
-            return func.apply(self || this, args);
+            var res = func.apply(self || this, args);
         }
         finally {
-            args.forEach(function (f) f && f.remove(false));
+            if (!checked || res !== true)
+                args.forEach(function (f) f && f.remove(false));
         }
+        return res;
     }
 }, {
     /**
diff --git a/common/modules/services.jsm b/common/modules/services.jsm
index 1460cf83..7be520f6 100644
--- a/common/modules/services.jsm
+++ b/common/modules/services.jsm
@@ -66,9 +66,9 @@ const Services = Module("Services", {
         this.addClass("Find",         "@mozilla.org/embedcomp/rangefind;1",        Ci.nsIFind);
         this.addClass("HtmlConverter","@mozilla.org/widget/htmlformatconverter;1", Ci.nsIFormatConverter);
         this.addClass("HtmlEncoder",  "@mozilla.org/layout/htmlCopyEncoder;1",     Ci.nsIDocumentEncoder);
-        this.addClass("Process",      "@mozilla.org/process/util;1",               Ci.nsIProcess);
+        this.addClass("Process",      "@mozilla.org/process/util;1",               Ci.nsIProcess, "init");
         this.addClass("String",       "@mozilla.org/supports-string;1",            Ci.nsISupportsString);
-        this.addClass("Timer",        "@mozilla.org/timer;1",                      Ci.nsITimer);
+        this.addClass("Timer",        "@mozilla.org/timer;1",                      Ci.nsITimer, "initWithCallback");
         this.addClass("Xmlhttp",      "@mozilla.org/xmlextras/xmlhttprequest;1",   Ci.nsIXMLHttpRequest);
         this.addClass("ZipReader",    "@mozilla.org/libjar/zip-reader;1",          Ci.nsIZipReader, "open");
         this.addClass("ZipWriter",    "@mozilla.org/zipwriter;1",                  Ci.nsIZipWriter);
@@ -80,7 +80,7 @@ const Services = Module("Services", {
             if (!ifaces)
                 return res.wrappedJSObject;
             Array.concat(ifaces).forEach(function (iface) res.QueryInterface(iface));
-            if (init)
+            if (init && args.length)
                 res[init].apply(res, args);
             return res;
         }
@@ -120,7 +120,9 @@ const Services = Module("Services", {
      */
     addClass: function (name, class_, ifaces, init) {
         const self = this;
-        return this[name] = function () self._create(class_, ifaces, "createInstance", init, arguments);
+        this[name] = function () self._create(class_, ifaces, "createInstance", init, arguments);
+        update.apply(null, [this[name]].concat(ifaces));
+        return this[name];
     },
 
     /**