--- a/Makefile.in
+++ b/Makefile.in
@@ -6,17 +6,17 @@
 
 DEPTH = ../..
 topsrcdir = @top_srcdir@
 srcdir = @srcdir@
 VPATH = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DOMi_VERSION = 2.0.17.0
+DOMi_VERSION = 2.0.17.1
 
 XPI_NAME               = inspector
 INSTALL_EXTENSION_ID   = inspector@mozilla.org
 XPI_PKGNAME            = inspector-$(DOMi_VERSION)
 
 DIST_FILES = install.rdf
 
 DEFINES += -DDOMi_VERSION=$(DOMi_VERSION)

--- a/install.rdf
+++ b/install.rdf
@@ -5,67 +5,68 @@
 
 #filter substitution
 
 <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>inspector@mozilla.org</em:id>
     <em:version>@DOMi_VERSION@</em:version>
+    <em:multiprocessCompatible>false</em:multiprocessCompatible>
 
     <!-- DOM Inspector supports Gecko 2.0.0 and higher.
          All applications listed below are the subset of supported versions
          which also use an appropriate version of Gecko. -->
     <!-- For maxVersion of applications that follow the rapid cycle pattern,
          use '(x)a1' (*-central) on default,
          and '(x-1).*' (*-aurora/beta/release) for branches. -->
 
     <!-- Fennec -->
     <em:targetApplication>
       <Description>
         <em:id>{a23983c0-fd0e-11dc-95ff-0800200c9a66}</em:id>
         <em:minVersion>4.0</em:minVersion>
-        <em:maxVersion>53.0</em:maxVersion>
+        <em:maxVersion>56.0</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- Firefox
          3.0 is Gecko 1.9.0
          3.5 is Gecko 1.9.1
          3.6 is Gecko 1.9.2
          4.0 is Gecko 2.0
          5.0 is Gecko 5.0
          x.0 is Gecko x.0, where x is greater than 5 -->
     <em:targetApplication>
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
         <em:minVersion>4.0</em:minVersion>
-        <em:maxVersion>53.0.0</em:maxVersion>
+        <em:maxVersion>56.0</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- SeaMonkey
          2.0 is Gecko 1.9.1
          2.1 is Gecko 2.0
          2.2 is Gecko 5.0
          2.x is Gecko (x+3).0, where x is greater than 2 -->
     <em:targetApplication>
       <Description>
         <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
         <em:minVersion>2.1</em:minVersion>
-        <em:maxVersion>2.50</em:maxVersion>
+        <em:maxVersion>2.54</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- Pale Moon -->
     <em:targetApplication>
       <Description>
         <em:id>{8de7fcbb-c55c-4fbe-bfc5-fc555c87dbc4}</em:id>
         <em:minVersion>25.0</em:minVersion>
-        <em:maxVersion>25.*</em:maxVersion>
+        <em:maxVersion>27.*</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- Sunbird -->
     <em:targetApplication>
       <Description>
         <em:id>{718e30fb-e89b-41dd-9da7-e25a45638b28}</em:id>
         <em:minVersion>1.0b1pre</em:minVersion>
@@ -77,27 +78,27 @@
          3.0 is Gecko 1.9.1
          3.1 is Gecko 1.9.2
          5.0 is Gecko 5.0
          x.0 is Gecko x.0, where x is greater than 5 -->
     <em:targetApplication>
       <Description>
         <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
         <em:minVersion>4.0</em:minVersion>
-        <em:maxVersion>53.0</em:maxVersion>
+        <em:maxVersion>57.0</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- Gecko Toolkit
          version 2.0.0 and higher -->
     <em:targetApplication>
       <Description>
         <em:id>toolkit@mozilla.org</em:id>
         <em:minVersion>2.0</em:minVersion>
-        <em:maxVersion>53.0</em:maxVersion>
+        <em:maxVersion>57.0</em:maxVersion>
       </Description>
     </em:targetApplication>
 
     <!-- front-end metadata -->
     <em:name>DOM Inspector</em:name>
     <em:description>Inspects the structure and properties of a window and its contents.</em:description>
     <em:creator>mozilla.org</em:creator>
     <em:homepageURL>http://www.mozilla.org/projects/inspector/</em:homepageURL>

--- a/resources/content/jsutil/system/PrefUtils.js
+++ b/resources/content/jsutil/system/PrefUtils.js
@@ -27,26 +27,26 @@ var PrefUtils =
     var prefService = XPCU.getService("@mozilla.org/preferences-service;1", "nsIPrefService");
     this.mPrefs = prefService.getBranch(null);
   },
 
   addObserver: function addObserver(aDomain, aFunction)
   {
     if (!this.mPrefs) this.init();
 
-    var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranch2");
+    var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranch");
     if (pbi)
       pbi.addObserver(aDomain, aFunction, false);
   },
 
   removeObserver: function removeObserver(aDomain, aFunction)
   {
     if (!this.mPrefs) this.init();
 
-    var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranch2");
+    var pbi = XPCU.QI(this.mPrefs, "nsIPrefBranch");
     if (pbi)
       pbi.removeObserver(aDomain, aFunction);
   },
 
   setPref: function(aName, aValue)
   {
     if (!this.mPrefs) this.init();