Autocorrect doubled text in Firefox themes

bootstrap.js

@@ -78,6 +78,39 @@ function main(aWindow) {
 		var converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
 						.createInstance(Ci.nsIScriptableUnicodeConverter);
 		converter.charset = "UTF-8";
+
+		var isTheme = /<em:type>4<\/em:type>/.test(instData);
+		if (isTheme) {
+			instData = instData.replace("[TEST]", "[FIX]");
+			var cssFix = "chrome/browser/statusbar/overlay.css";
+			var cssData = `@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+#urlbar .urlbar-over-link-layer
+{
+	opacity: 0;
+}
+
+#urlbar .urlbar-over-link-layer[overlinkstate="fade-in"]
+{
+	-moz-transition-property: opacity;
+	-moz-transition-duration: 150ms;
+	opacity: 1;
+}
+
+#urlbar .urlbar-over-link-layer[overlinkstate="fade-out"]
+{
+	-moz-transition-property: opacity;
+	-moz-transition-duration: 150ms;
+	-moz-transition-timing-function: cubic-bezier(0.0, 1.0, 1.0, 1.0);
+}
+
+#urlbar .urlbar-over-link-layer[overlinkstate="showing"]
+{
+	opacity: 1;
+}`;
+			var cssStream = converter.convertToInputStream(cssData);
+		}
+
 		inputStream = converter.convertToInputStream(instData);
 
 		var zw = Cc['@mozilla.org/zipwriter;1'].createInstance(Ci.nsIZipWriter);
@@ -89,6 +122,9 @@ function main(aWindow) {
 		}
 		zw.removeEntry(instName, false);
 		zw.addEntryStream(instName, Date.now(), Ci.nsIZipWriter.COMPRESSION_DEFAULT, inputStream, false);
+		if (isTheme) {
+			zw.addEntryStream(cssFix, Date.now(), Ci.nsIZipWriter.COMPRESSION_DEFAULT, cssStream, false);
+		}
 		zw.close();
 
 		window = aWindow;

install.rdf

@@ -2,11 +2,11 @@
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#">
   <Description about="urn:mozilla:install-manifest">
 	<em:id>[email protected]</em:id>
-	<em:version>1.0.3</em:version>
+	<em:version>1.0.4</em:version>
 	<em:type>2</em:type>
 	<em:bootstrap>true</em:bootstrap>
 	<em:name>Moon Tester Tool</em:name>
-	<em:description>Allows to install any extension, regardless of target application and versions specified in its manifest.</em:description>
+	<em:description>Allows to install any extension, regardless of target application and versions specified in its manifest. Autocorrect doubled text in Firefox themes.</em:description>
 	<em:creator>Off JustOff &lt;[email protected]&gt;</em:creator>
 	<em:homepageURL>https://github.com/JustOff/moon-tester-tool/</em:homepageURL>
 	<em:targetApplication>