diff --git a/core/main.js b/core/main.js
index 9bce84ba..0d75c299 100644
--- a/core/main.js
+++ b/core/main.js
@@ -93,22 +93,19 @@ main._showReleaseNotes = function (details) {
         });
     } else if (details.reason === chrome.runtime.OnInstalledReason.UPDATE) {
 
-        let newValue = lastMappingUpdate;
-        let oldValue = "";
-
         // If add-on update true, check last update of mappings.js
         chrome.storage.sync.get([Setting.LAST_MAPPING_UPDATE, Setting.HIDE_RELEASE_NOTES], function (items) {
 
-            oldValue = items.lastMappingUpdate;
+            let mappingUpdate = items.lastMappingUpdate !== lastMappingUpdate;
 
-            if (oldValue !== newValue || !items.hideReleaseNotes) {
+            if (mappingUpdate || !items.hideReleaseNotes) {
                 // Updated mappings.js
                 chrome.storage.sync.set({
-                    [Setting.LAST_MAPPING_UPDATE]: newValue
+                    [Setting.LAST_MAPPING_UPDATE]: lastMappingUpdate
                 }, function() {
                     if (!items.hideReleaseNotes) {
                         chrome.tabs.create({
-                            'url': chrome.extension.getURL('pages/updates/updates.html'),
+                            'url': chrome.extension.getURL('pages/updates/updates.html?mappingupdate=' + mappingUpdate),
                             'active': false
                         });
                     }
diff --git a/pages/updates/updates.css b/pages/updates/updates.css
index 67071067..69a8bc63 100644
--- a/pages/updates/updates.css
+++ b/pages/updates/updates.css
@@ -39,11 +39,11 @@ input[type=radio], label {
 }
 
 #history {
-	cursor: pointer;
-	font-size: 24px;
-	font-weight: bold;
+    cursor: pointer;
+    font-size: 24px;
+    font-weight: bold;
 }
 
-#history-release-notes {
-
+#generator-section {
+    display: none;
 }
diff --git a/pages/updates/updates.html b/pages/updates/updates.html
index 00863a03..8d96e91b 100644
--- a/pages/updates/updates.html
+++ b/pages/updates/updates.html
@@ -25,27 +25,30 @@
                     </div>
                         <ul>
                             <li>Implemented: Hide icon setting if not supported</li>
+                            <li>Implemented: Show the rule set generator only when there are new CDNs (reported by <a href="https://addons.mozilla.org/en-US/firefox/addon/localcdn-fork-of-decentraleyes/reviews/1572952/">review</a>)</li>
                         </ul>
-                    <div class="topic-label">
-                        Generate rule sets for uBlock or uMatrix
+                    <div id="generator-section">
+                        <div class="topic-label">
+                            Generate rule sets for uBlock or uMatrix
+                        </div>
+                        <div class="ruleset-generator">
+                            <label class="b-contain" for="generate-ublock-rules">uBlock
+                                <input id="generate-ublock-rules" name="rule-sets" data-option="uBlock" type="radio" value="uBlock">
+                                <div class="b-input"></div>
+                            </label>
+                        </div>
+                        <div class="ruleset-generator">
+                            <label class="b-contain" for="generate-umatrix-rules">uMatrix
+                                <input id="generate-umatrix-rules" name="rule-sets" data-option="uMatrix" type="radio" value="uMatrix">
+                                <div class="b-input"></div>
+                            </label>
+                        </div>
+                        <div>
+                            <textarea rows="12" cols="15" id="generated-rules" readonly></textarea>
+                            <input id="button-copy-rule-set" type="button" value="Copy">
+                        </div>
+                        <hr/>
                     </div>
-                    <div class="ruleset-generator">
-                        <label class="b-contain" for="generate-ublock-rules">uBlock
-                            <input id="generate-ublock-rules" name="rule-sets" data-option="uBlock" type="radio" value="uBlock">
-                            <div class="b-input"></div>
-                        </label>
-                    </div>
-                    <div class="ruleset-generator">
-                        <label class="b-contain" for="generate-umatrix-rules">uMatrix
-                            <input id="generate-umatrix-rules" name="rule-sets" data-option="uMatrix" type="radio" value="uMatrix">
-                            <div class="b-input"></div>
-                        </label>
-                    </div>
-                    <div>
-                        <textarea rows="12" cols="15" id="generated-rules" readonly></textarea>
-                        <input id="button-copy-rule-set" type="button" value="Copy">
-                    </div>
-                    <hr/>
                     <div id="history"><span id="history-indicator">+</span> Previous Versions</div>
                     <div id="history-release-notes" style="display: none;">
                         <p class='release-date'>2020-07-19 (v2.2.14)</p>
diff --git a/pages/updates/updates.js b/pages/updates/updates.js
index 5a638959..0882d677 100644
--- a/pages/updates/updates.js
+++ b/pages/updates/updates.js
@@ -89,6 +89,12 @@ updates._onDocumentLoaded = function () {
     updateElements.copyRuleSet.addEventListener('click', updates._copyRuleSet);
 
     document.getElementById('history').addEventListener('click', updates._openHistoryReleaseNotes);
+
+    // GET parameter to display the rule set generator
+    let urlParams = new URLSearchParams(window.location.search);
+    if (urlParams.get('mappingupdate') === 'true') {
+        document.getElementById('generator-section').style.display = 'block';
+    }
 };