Firefox: update manifest files when building

platform/firefox/install.rdf

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <r:RDF xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.mozilla.org/2004/em-rdf#">
     <r:Description about="urn:mozilla:install-manifest">
-        <id>{2b10c1c8-a11f-4bad-fe9c-1c11e82cac42}</id>
-        <version>0.7.2.0</version>
-        <name>µBlock</name>
-        <description>Finally, an efficient blocker. Easy on CPU and memory.</description>
+        <id>{{2b10c1c8-a11f-4bad-fe9c-1c11e82cac42}}</id>
+        <version>{version}</version>
+        <name>{name}</name>
+        <description>{description}</description>
         <homepageURL>https://github.com/gorhill/uBlock</homepageURL>
-        <creator>Raymond Hill</creator>
+        <creator>{author}</creator>
         <type>2</type>
         <bootstrap>true</bootstrap>
         <multiprocessCompatible>true</multiprocessCompatible>
@@ -16,7 +16,7 @@
         <!-- Firefox -->
         <targetApplication>
             <r:Description>
-                <id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</id>
+                <id>{{ec8030f7-c20a-464f-9b0e-13a3a9e97384}}</id>
                 <minVersion>29.0</minVersion>
                 <maxVersion>37.0</maxVersion>
             </r:Description>
@@ -25,7 +25,7 @@
         <!-- SeaMonkey -->
         <targetApplication>
             <r:Description>
-                <id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</id>
+                <id>{{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}}</id>
                 <minVersion>2.26</minVersion>
                 <maxVersion>2.34</maxVersion>
             </r:Description>