diff --git a/admin/settings/appearance.php b/admin/settings/appearance.php
index 49fb7ad4d4d..1df0a092cbe 100644
--- a/admin/settings/appearance.php
+++ b/admin/settings/appearance.php
@@ -220,7 +220,6 @@ if ($hassiteconfig or has_any_capability($capabilities, $systemcontext)) { // sp
     $ADMIN->add('appearance', $temp);
 
     $temp = new admin_settingpage('ajax', new lang_string('ajaxuse'));
-    $temp->add(new admin_setting_configcheckbox('enableajax', new lang_string('enableajax', 'admin'), new lang_string('configenableajax', 'admin'), 1));
     $temp->add(new admin_setting_configcheckbox('useexternalyui', new lang_string('useexternalyui', 'admin'), new lang_string('configuseexternalyui', 'admin'), 0));
     $temp->add(new admin_setting_configcheckbox('yuicomboloading', new lang_string('yuicomboloading', 'admin'), new lang_string('configyuicomboloading', 'admin'), 1));
     $setting = new admin_setting_configcheckbox('cachejs', new lang_string('cachejs', 'admin'), new lang_string('cachejs_help', 'admin'), 1);
diff --git a/blocks/course_overview/renderer.php b/blocks/course_overview/renderer.php
index fcde4f4597c..3efcd95f5e7 100644
--- a/blocks/course_overview/renderer.php
+++ b/blocks/course_overview/renderer.php
@@ -48,10 +48,7 @@ class block_course_overview_renderer extends plugin_renderer_base {
         // Intialise string/icon etc if user is editing and courses > 1
         if ($this->page->user_is_editing() && (count($courses) > 1)) {
             $userediting = true;
-            // If ajaxenabled then include DND JS and replace link with move image.
-            if (ajaxenabled()) {
-                $this->page->requires->js_init_call('M.block_course_overview.add_handles');
-            }
+            $this->page->requires->js_init_call('M.block_course_overview.add_handles');
 
             // Check if course is moving
             $ismovingcourse = optional_param('movecourse', FALSE, PARAM_BOOL);
diff --git a/course/format/formatlegacy.php b/course/format/formatlegacy.php
index f353a4b5816..665f5833821 100644
--- a/course/format/formatlegacy.php
+++ b/course/format/formatlegacy.php
@@ -147,7 +147,6 @@ class format_legacy extends format_base {
      *
      * The returned object's property (boolean)capable indicates that
      * the course format supports Moodle course ajax features.
-     * The property (array)testedbrowsers can be used as a parameter for {@link ajaxenabled()}.
      *
      * @return stdClass
      */
@@ -162,9 +161,6 @@ class format_legacy extends format_base {
             if (isset($formatsupport->capable)) {
                 $ajaxsupport->capable = $formatsupport->capable;
             }
-            if (is_array($formatsupport->testedbrowsers)) {
-                $ajaxsupport->testedbrowsers = $formatsupport->testedbrowsers;
-            }
         }
         return $ajaxsupport;
     }
@@ -360,4 +356,4 @@ class format_legacy extends format_base {
         }
         return $this->update_format_options($data);
     }
-}
\ No newline at end of file
+}
diff --git a/course/format/lib.php b/course/format/lib.php
index a68ce5ae500..af2a6c6b60a 100644
--- a/course/format/lib.php
+++ b/course/format/lib.php
@@ -353,7 +353,6 @@ abstract class format_base {
      *
      * The returned object's property (boolean)capable indicates that
      * the course format supports Moodle course ajax features.
-     * The property (array)testedbrowsers can be used as a parameter for {@link ajaxenabled()}.
      *
      * @return stdClass
      */
@@ -361,7 +360,6 @@ abstract class format_base {
         // no support by default
         $ajaxsupport = new stdClass();
         $ajaxsupport->capable = false;
-        $ajaxsupport->testedbrowsers = array();
         return $ajaxsupport;
     }
 
diff --git a/course/format/topics/lib.php b/course/format/topics/lib.php
index 71a04529ad7..7c1ee6ec589 100644
--- a/course/format/topics/lib.php
+++ b/course/format/topics/lib.php
@@ -115,14 +115,12 @@ class format_topics extends format_base {
      *
      * The returned object's property (boolean)capable indicates that
      * the course format supports Moodle course ajax features.
-     * The property (array)testedbrowsers can be used as a parameter for {@link ajaxenabled()}.
      *
      * @return stdClass
      */
     public function supports_ajax() {
         $ajaxsupport = new stdClass();
         $ajaxsupport->capable = true;
-        $ajaxsupport->testedbrowsers = array('MSIE' => 6.0, 'Gecko' => 20061111, 'Safari' => 531, 'Chrome' => 6.0);
         return $ajaxsupport;
     }
 
diff --git a/course/format/upgrade.txt b/course/format/upgrade.txt
index f29a06e0681..3bc37eda9d3 100644
--- a/course/format/upgrade.txt
+++ b/course/format/upgrade.txt
@@ -2,6 +2,9 @@ This files describes API changes for course formats
 
 Overview of this plugin type at http://docs.moodle.org/dev/Course_formats
 
+=== 2.7 ===
+* The ->testedbrowsers array no longer needs to be defined in supports_ajax().
+
 === 2.6 ===
 
 * core_course_renderer::course_section_cm_edit_actions has two new optional arguments and now uses and action_menu component.
diff --git a/course/format/weeks/lib.php b/course/format/weeks/lib.php
index ded5ef0416f..e361deffaf3 100644
--- a/course/format/weeks/lib.php
+++ b/course/format/weeks/lib.php
@@ -122,14 +122,12 @@ class format_weeks extends format_base {
      *
      * The returned object's property (boolean)capable indicates that
      * the course format supports Moodle course ajax features.
-     * The property (array)testedbrowsers can be used as a parameter for {@link ajaxenabled()}.
      *
      * @return stdClass
      */
     public function supports_ajax() {
         $ajaxsupport = new stdClass();
         $ajaxsupport->capable = true;
-        $ajaxsupport->testedbrowsers = array('MSIE' => 6.0, 'Gecko' => 20061111, 'Safari' => 531, 'Chrome' => 6.0);
         return $ajaxsupport;
     }
 
diff --git a/course/lib.php b/course/lib.php
index 1ae3e947027..1110236f2e2 100644
--- a/course/lib.php
+++ b/course/lib.php
@@ -2333,7 +2333,6 @@ function course_format_uses_sections($format) {
  *
  * The returned object's property (boolean)capable indicates that
  * the course format supports Moodle course ajax features.
- * The property (array)testedbrowsers can be used as a parameter for {@see ajaxenabled()}.
  *
  * @param string $format
  * @return stdClass
@@ -3119,11 +3118,6 @@ function course_page_type_list($pagetype, $parentcontext, $currentcontext) {
 function course_ajax_enabled($course) {
     global $CFG, $PAGE, $SITE;
 
-    // Ajax must be enabled globally
-    if (!$CFG->enableajax) {
-        return false;
-    }
-
     // The user must be editing for AJAX to be included
     if (!$PAGE->user_is_editing()) {
         return false;
diff --git a/course/view.php b/course/view.php
index 16b2ca026c3..c5ec9d0216f 100644
--- a/course/view.php
+++ b/course/view.php
@@ -219,10 +219,8 @@
         redirect($CFG->wwwroot .'/');
     }
 
-    $ajaxenabled = ajaxenabled();
-
     $completion = new completion_info($course);
-    if ($completion->is_enabled() && $ajaxenabled) {
+    if ($completion->is_enabled()) {
         $PAGE->requires->string_for_js('completion-title-manual-y', 'completion');
         $PAGE->requires->string_for_js('completion-title-manual-n', 'completion');
         $PAGE->requires->string_for_js('completion-alt-manual-y', 'completion');
@@ -251,7 +249,7 @@
     $PAGE->set_heading($course->fullname);
     echo $OUTPUT->header();
 
-    if ($completion->is_enabled() && $ajaxenabled) {
+    if ($completion->is_enabled()) {
         // This value tracks whether there has been a dynamic change to the page.
         // It is used so that if a user does this - (a) set some tickmarks, (b)
         // go to another page, (c) clicks Back button - the page will
diff --git a/group/index.php b/group/index.php
index 5e839183ab2..f3e7f37f6d3 100644
--- a/group/index.php
+++ b/group/index.php
@@ -152,20 +152,11 @@ $currenttab = 'groups';
 require('tabs.php');
 
 $disabled = 'disabled="disabled"';
-$ajaxenabled = ajaxenabled();
-if ($ajaxenabled) {
-    // Some buttons are enabled if single group selected
-    $showaddmembersform_disabled = $singlegroup ? '' : $disabled;
-    $showeditgroupsettingsform_disabled = $singlegroup ? '' : $disabled;
-    $deletegroup_disabled = count($groupids)>0 ? '' : $disabled;
-} else {
-    // Do not disable buttons. The buttons work based on the selected group,
-    // which you can change without reloading the page, so it is not appropriate
-    // to disable them if no group is selected.
-    $showaddmembersform_disabled = '';
-    $showeditgroupsettingsform_disabled = '';
-    $deletegroup_disabled = '';
-}
+
+// Some buttons are enabled if single group selected.
+$showaddmembersform_disabled = $singlegroup ? '' : $disabled;
+$showeditgroupsettingsform_disabled = $singlegroup ? '' : $disabled;
+$deletegroup_disabled = count($groupids) > 0 ? '' : $disabled;
 
 echo $OUTPUT->heading(format_string($course->shortname, true, array('context' => $context)) .' '.$strgroups, 3);
 echo '<form id="groupeditform" action="index.php" method="post">'."\n";
@@ -179,11 +170,7 @@ echo '<tr>'."\n";
 echo "<td>\n";
 echo '<p><label for="groups"><span id="groupslabel">'.get_string('groups').':</span><span id="thegrouping">&nbsp;</span></label></p>'."\n";
 
-if ($ajaxenabled) { // TODO: move this to JS init!
-    $onchange = 'M.core_group.membersCombo.refreshMembers();';
-} else {
-    $onchange = '';
-}
+$onchange = 'M.core_group.membersCombo.refreshMembers();';
 
 echo '<select name="groups[]" multiple="multiple" id="groups" size="15" class="select" onchange="'.$onchange.'"'."\n";
 echo ' onclick="window.status=this.selectedIndex==-1 ? \'\' : this.options[this.selectedIndex].title;" onmouseout="window.status=\'\';">'."\n";
@@ -276,10 +263,8 @@ echo '</table>'."\n";
 echo '</div>'."\n";
 echo '</form>'."\n";
 
-if ($ajaxenabled) {
-    $PAGE->requires->js_init_call('M.core_group.init_index', array($CFG->wwwroot, $courseid));
-    $PAGE->requires->js_init_call('M.core_group.groupslist', array($preventgroupremoval));
-}
+$PAGE->requires->js_init_call('M.core_group.init_index', array($CFG->wwwroot, $courseid));
+$PAGE->requires->js_init_call('M.core_group.groupslist', array($preventgroupremoval));
 
 echo $OUTPUT->footer();
 
diff --git a/lang/en/admin.php b/lang/en/admin.php
index c414ca615fb..16a05fb392e 100644
--- a/lang/en/admin.php
+++ b/lang/en/admin.php
@@ -198,7 +198,6 @@ $string['configdoctonewwindow'] = 'If you enable this, then links to Moodle Docs
 $string['configeditordictionary'] = 'This value will be used if aspell doesn\'t have dictionary for users own language.';
 $string['configeditorfontlist'] = 'Select the fonts that should appear in the editor\'s drop-down list.';
 $string['configemailchangeconfirmation'] = 'Require an email confirmation step when users change their email address in their profile.';
-$string['configenableajax'] = 'This setting controls the use of AJAX across the site. AJAX is required for certain functionality such as drag and drop.';
 $string['configenablecalendarexport'] = 'Enable exporting or subscribing to calendars.';
 $string['configenablecomments'] = 'Enable comments';
 $string['configenablecourserequests'] = 'This will allow any user to request a course be created.';
@@ -461,7 +460,6 @@ $string['emoticons_desc'] = 'This form defines the emoticons (or smileys) used a
 * Alternative text (optional) - String identifier and component of the alternative text of the emoticon.';
 $string['emoticonsreset'] = 'Reset emoticons setting to default values';
 $string['emptysettingvalue'] = 'Empty';
-$string['enableajax'] = 'Enable AJAX';
 $string['enableblogs'] = 'Enable blogs';
 $string['enablecalendarexport'] = 'Enable calendar export';
 $string['enablecomments'] = 'Enable comments';
diff --git a/lib/ajax/ajaxlib.php b/lib/ajax/ajaxlib.php
index c9f21f85344..56fd0087272 100644
--- a/lib/ajax/ajaxlib.php
+++ b/lib/ajax/ajaxlib.php
@@ -40,34 +40,6 @@ function user_preference_allow_ajax_update($name, $paramtype) {
     $USER->ajax_updatable_user_prefs[$name] = $paramtype;
 }
 
-/**
- * Returns whether ajax is enabled/allowed or not.
- * @param array $browsers optional list of alowed browsers, empty means use default list
- * @return bool
- */
-function ajaxenabled(array $browsers = null) {
-    global $CFG;
-
-    if (!empty($browsers)) {
-        $valid = false;
-        foreach ($browsers as $brand => $version) {
-            if (core_useragent::check_browser_version($brand, $version)) {
-                $valid = true;
-            }
-        }
-
-        if (!$valid) {
-            return false;
-        }
-    }
-
-    if (!empty($CFG->enableajax)) {
-        return true;
-    } else {
-        return false;
-    }
-}
-
 /**
  * Starts capturing output whilst processing an AJAX request.
  *
diff --git a/lib/deprecatedlib.php b/lib/deprecatedlib.php
index a24e8ee8858..0116261de9d 100644
--- a/lib/deprecatedlib.php
+++ b/lib/deprecatedlib.php
@@ -4266,3 +4266,15 @@ function can_use_html_editor() {
     debugging('can_use_html_editor has been deprecated please update your code to assume it returns true.', DEBUG_DEVELOPER);
     return true;
 }
+
+/**
+ * Returns whether ajax is enabled/allowed or not.
+ * @param array $browsers optional list of alowed browsers, empty means use default list
+ * @return bool
+ * @deprecated since 2.7 MDL-33099 - please do not use this function any more.
+ * @todo MDL-44088 This will be removed in Moodle 2.9.
+ */
+function ajaxenabled(array $browsers = null) {
+    debugging('ajaxenabled() is deprecated.', DEBUG_DEVELOPER);
+    return true;
+}
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 780ee748cb1..f00b412142b 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -17,6 +17,7 @@ DEPRECATIONS:
 * The constants FRONTPAGECOURSELIST, FRONTPAGETOPICONLY & FRONTPAGECOURSELIMIT have been removed.
 * Various cm_info methods have been deprecated in favour of their read-only properties (get_url(), get_content(), get_extra_classes(),
   get_on_click(), get_custom_data(), get_after_link, get_after_edit_icons)
+* The ajaxenabled function has been deprecated and always returns true. All code should be fully functional in Javascript.
 
 YUI:
   * The lightbox attribute for moodle-core-notification-dialogue has been
diff --git a/mod/feedback/edit.php b/mod/feedback/edit.php
index b87b4cb5f41..e4214c80601 100644
--- a/mod/feedback/edit.php
+++ b/mod/feedback/edit.php
@@ -160,7 +160,7 @@ $PAGE->set_title($feedback->name);
 
 //Adding the javascript module for the items dragdrop.
 if (count($feedbackitems) > 1) {
-    if ($do_show == 'edit' and $CFG->enableajax) {
+    if ($do_show == 'edit') {
         $PAGE->requires->strings_for_js(array(
                'pluginname',
                'move_item',
diff --git a/rating/lib.php b/rating/lib.php
index 69c90c4141d..4aaa70b346b 100644
--- a/rating/lib.php
+++ b/rating/lib.php
@@ -1002,9 +1002,7 @@ class rating_manager {
             return true;
         }
 
-        if (!empty($CFG->enableajax)) {
-            $page->requires->js_init_call('M.core_rating.init');
-        }
+        $page->requires->js_init_call('M.core_rating.init');
         $done = true;
 
         return true;