diff --git a/common/content/modes.js b/common/content/modes.js
index 8ca791fc..550e32e4 100644
--- a/common/content/modes.js
+++ b/common/content/modes.js
@@ -459,7 +459,7 @@ var Modes = Module("modes", {
 
         get count() !this.insert,
 
-        _display: Class.Memoize(function _display() this.name.replace("_", " ", "g")),
+        _display: Class.Memoize(function _display() this.name.replace(/_/g, " ")),
 
         display: function display() this._display,
 
diff --git a/common/modules/commands.jsm b/common/modules/commands.jsm
index 501f1393..1449aaf9 100644
--- a/common/modules/commands.jsm
+++ b/common/modules/commands.jsm
@@ -1431,7 +1431,7 @@ var Commands = Module("commands", {
             else if ((res = /^(")((?:[^\\"]|\\.)*)("?)/.exec(str)))
                 arg += keepQuotes ? res[0] : JSON.parse(fixEscapes(res[0]) + (res[3] ? "" : '"'));
             else if ((res = /^(')((?:[^']|'')*)('?)/.exec(str)))
-                arg += keepQuotes ? res[0] : res[2].replace("''", "'", "g");
+                arg += keepQuotes ? res[0] : res[2].replace(/''/g, "'");
             else
                 break;
 
diff --git a/common/modules/storage.jsm b/common/modules/storage.jsm
index 26d6ce11..ae2d4d92 100644
--- a/common/modules/storage.jsm
+++ b/common/modules/storage.jsm
@@ -741,7 +741,7 @@ var File = Class("File", {
             path = OS.Path.join(OS.Constants.Path.homeDir,
                                 path.substr(2));
 
-        return OS.Path.normalize(path.replace("/", File.PATH_SEP, "g"));
+        return OS.Path.normalize(path.replace(/\//g, File.PATH_SEP));
     },
 
     expandPathList: function (list) list.map(this.expandPath),
diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 62cddf97..33f6c094 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -608,7 +608,7 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
     escapeString: function escapeString(str, delimiter) {
         if (delimiter == undefined)
             delimiter = '"';
-        return delimiter + str.replace(/([\\'"])/g, "\\$1").replace("\n", "\\n", "g").replace("\t", "\\t", "g") + delimiter;
+        return delimiter + str.replace(/([\\'"])/g, "\\$1").replace(/\n/g, "\\n").replace(/\t/g, "\\t") + delimiter;
     },
 
     /**