diff --git a/extension/_locales/en/messages.json b/extension/_locales/en/messages.json
--- a/extension/_locales/en/messages.json
+++ b/extension/_locales/en/messages.json
@@ -9,6 +9,9 @@
     "options_save_success": {
         "message": "Settings successfully saved"
     },
+    "options_not_supported_os": {
+        "message": "This extension is not supported on this operating system."
+    },
 
     "options_tab_general": {
         "description": "The 'General settings' tab in settings",
diff --git a/extension/options.html b/extension/options.html
--- a/extension/options.html
+++ b/extension/options.html
@@ -18,6 +18,8 @@
 </ul>
 
 <div class="tab active" data-tab-id="general">
+    <p class="not-supported-info" data-i18n="options_not_supported_os">I18N</p>
+
     <ul id="extensions-selection">
         <li>
             <label>
diff --git a/extension/options.css b/extension/options.css
--- a/extension/options.css
+++ b/extension/options.css
@@ -4,6 +4,16 @@
     overflow: hidden;
 }
 
+.not-supported-info {
+    display: none;
+}
+body.not-supported .not-supported-info {
+    display: block;
+}
+body.not-supported #extensions-selection {
+    display: none;
+}
+
 .tabbar {
     display: block;
     padding: 0;
diff --git a/extension/options.js b/extension/options.js
--- a/extension/options.js
+++ b/extension/options.js
@@ -129,23 +129,30 @@
         });
     }
 
-    loadSettings();
-
-    // auto save when changing any setting
-    // TODO can we do that on closing, or does it not matter how often we do chrome storage sync thing?
-    document.querySelectorAll("input[type=checkbox]").forEach(function (item) {
-        item.addEventListener("click", function () {
-            var saveMessage = document.getElementById("save-message");
-            saveMessage.innerText = "";
-
-            saveSettings(function (error) {
-                if (error) {
-                    saveMessage.innerText = chrome.i18n.getMessage("options_save_failed");
-                    return;
-                }
-
-                //saveMessage.innerText = chrome.i18n.getMessage("options_save_success");
-                sendMessage("changed");
+    // check whether the platform is supported before loading and activating settings
+    chrome.runtime.getPlatformInfo(function (info) {
+        if (!SUPPORTED_PLATFORMS.includes(info.os)) {
+            document.body.classList.add("not-supported");
+            return;
+        }
+
+        loadSettings();
+
+        // auto save when changing any setting
+        // TODO can we do that on closing, or does it not matter how often we do chrome storage sync thing?
+        document.querySelectorAll("input[type=checkbox]").forEach(function (item) {
+            item.addEventListener("click", function () {
+                var saveMessage = document.getElementById("save-message");
+                saveMessage.innerText = "";
+
+                saveSettings(function (error) {
+                    if (error) {
+                        saveMessage.innerText = chrome.i18n.getMessage("options_save_failed");
+                        return;
+                    }
+
+                    sendMessage("changed");
+                });
             });
         });
     });