diff --git a/source/chrome/content/allinonegest/gestimp.js b/source/chrome/content/allinonegest/gestimp.js
index 161d612..fbbb81e 100644
--- a/source/chrome/content/allinonegest/gestimp.js
+++ b/source/chrome/content/allinonegest/gestimp.js
@@ -687,27 +687,51 @@ mgsuite.imp = {
   },
   
   aioFavoriteURL: function(suffix) {
-    var shortcutURL = null;
-    var bmsvc = Components.classes["@mozilla.org/browser/nav-bookmarks-service;1"].getService(Components.interfaces.nsINavBookmarksService);
+    function loadKeywordPage(keyword, url) {
+      if (!url) {
+        alert(mgsuite.overlay.aioGetStr("g.keywordMissing") + " " + keyword);
+        return;
+      }
+      
+      switch (mgsuite.overlay.aioWindowType) {
+        case "browser":
+          loadURI(url);
+          break;
+        
+        default:
+          if (mgsuite.overlay.aioIsFx) {
+            openNewTabWith(url);
+          } else {
+            openNewTabWindowOrExistingWith(Components.interfaces.nsIBrowserDOMWindow.OPEN_NEWTAB, url, null, false);
+          }
+      }
+    }
+    
     var keyword = mgsuite.overlay.aioGetStr("g.keywordForGesture") + suffix;
-    var shortcutURI = bmsvc.getURIForKeyword(keyword);
-    if (shortcutURI) shortcutURL = shortcutURI.spec;
-    if (!shortcutURL) {
-      alert(mgsuite.overlay.aioGetStr("g.keywordMissing") + " " + keyword);
+    
+    try {
+      // try to fetch url keyword using old method (removed in Fx 53)
+      var url = null;
+      var bmsvc = Components.classes["@mozilla.org/browser/nav-bookmarks-service;1"].getService(Components.interfaces.nsINavBookmarksService);
+      var shortcutURI = bmsvc.getURIForKeyword(keyword);
+      if (shortcutURI) url = shortcutURI.spec;
+      loadKeywordPage(keyword, url);
       return;
+
+    } catch (e) {
     }
     
-    switch (mgsuite.overlay.aioWindowType) {
-      case "browser":
-        loadURI(shortcutURL);
-        break;
+    if (!url) {
+      // if old method failed, then try new method (since Fx 40)
+      Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+      XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils", "resource://gre/modules/PlacesUtils.jsm");
       
-      default:
-        if (mgsuite.overlay.aioIsFx) {
-          openNewTabWith(shortcutURL);
-        } else {
-          openNewTabWindowOrExistingWith(Components.interfaces.nsIBrowserDOMWindow.OPEN_NEWTAB, shortcutURL, null, false);
-        }
+      PlacesUtils.keywords.fetch(keyword).then(entry => {
+        /* entry is either null, or a keyword entry */
+          loadKeywordPage(keyword, entry ? entry.url.href : null);
+        },
+        e => { /* failure */}
+      );
     }
   },
   
diff --git a/source/chrome/content/allinonegest/pref/customize.js b/source/chrome/content/allinonegest/pref/customize.js
index 0411953..0266540 100644
--- a/source/chrome/content/allinonegest/pref/customize.js
+++ b/source/chrome/content/allinonegest/pref/customize.js
@@ -636,6 +636,10 @@ function populateTree(aGesturesString, aFuncsString, aRockerString, customGestur
 }
 
 function ReadFile(file) {
+  if (typeof Services == 'undefined') {
+    Components.utils.import('resource://gre/modules/Services.jsm');
+  }
+  
   var ioService=Components.classes["@mozilla.org/network/io-service;1"]
       .getService(Components.interfaces.nsIIOService);
   var scriptableStream=Components
@@ -644,7 +648,14 @@ function ReadFile(file) {
 
 
   // newChannel was deprecated in Fx 48 in favour of newChannel2
-  var channel = ioService.newChannel2 ? ioService.newChannel2(file,null,null,null,null,null,null,null)
+  var channel = ioService.newChannel2 ? ioService.newChannel2(file,
+    null,
+    null,
+    null,
+    Services.scriptSecurityManager.getSystemPrincipal(),
+    Services.scriptSecurityManager.getSystemPrincipal(),
+    null,
+    null)
     : ioService.newChannel(file,null,null);
   var input=channel.open();
   scriptableStream.init(input);
diff --git a/source/install.rdf b/source/install.rdf
index 3d6f7b4..0f5cfa2 100644
--- a/source/install.rdf
+++ b/source/install.rdf
@@ -3,7 +3,7 @@
          xmlns:em="http://www.mozilla.org/2004/em-rdf#">
   <rdf:Description rdf:about="urn:mozilla:install-manifest">
     <em:id>mousegesturessuite@lemon_juice.addons.mozilla.org</em:id>
-    <em:version>2.5.0</em:version>
+    <em:version>2.5.1</em:version>
     <em:type>2</em:type>
     <em:unpack>true</em:unpack>
 	<em:multiprocessCompatible>true</em:multiprocessCompatible>
@@ -13,7 +13,7 @@
       <Description>
         <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
         <em:minVersion>2.22</em:minVersion>
-        <em:maxVersion>2.45.*</em:maxVersion>
+        <em:maxVersion>2.49.*</em:maxVersion>
       </Description>
     </em:targetApplication>
 	
@@ -22,7 +22,7 @@
       <rdf:Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
         <em:minVersion>25.0</em:minVersion>
-        <em:maxVersion>50.*</em:maxVersion>
+        <em:maxVersion>56.*</em:maxVersion>
       </rdf:Description>
     </em:targetApplication>