diff --git a/application/palemoon/components/permissions/aboutPermissions.xul b/application/palemoon/components/permissions/aboutPermissions.xul
index afd98247b1..dfee14756c 100644
--- a/application/palemoon/components/permissions/aboutPermissions.xul
+++ b/application/palemoon/components/permissions/aboutPermissions.xul
@@ -29,7 +29,7 @@
     <key key="&focusSearch.key;" modifiers="accel" oncommand="AboutPermissions.focusFilterBox();"/>
   </keyset>
 
-  <hbox flex="1" id="permissions-header">
+  <hbox id="permissions-header">
     <label id="permissions-pagetitle">&permissionsManager.title;</label>
   </hbox>
   <hbox flex="1" id="permissions-content" class="main-content">
diff --git a/application/palemoon/themes/windows/permissions/aboutPermissions.css b/application/palemoon/themes/windows/permissions/aboutPermissions.css
index fb28ef02a3..60ee816733 100644
--- a/application/palemoon/themes/windows/permissions/aboutPermissions.css
+++ b/application/palemoon/themes/windows/permissions/aboutPermissions.css
@@ -12,6 +12,11 @@
   padding-bottom: 0.5em;
 }
 
+/* content box */
+#permissions-content {
+  height: 100%;
+}
+
 /* sites box */
 
 #sites-box {