diff --git a/extension/constants.js b/extension/constants.js
--- a/extension/constants.js
+++ b/extension/constants.js
@@ -35,3 +35,5 @@
 };
 
 IS_FIREFOX = (typeof InstallTrigger !== "undefined"); // heh.
+
+SUPPORTED_PLATFORMS = ["linux", "openbsd"];
diff --git a/extension/extension.js b/extension/extension.js
--- a/extension/extension.js
+++ b/extension/extension.js
@@ -532,7 +532,16 @@
 // event immediately afterwards. Also avoid infinite restart loop then.
 var receivedMessageOnce = false;
 
-connectHost();
+// Check for supported platform to avoid loading it on e.g. Windows and then failing
+// when the extension got synced to another device and then failing
+chrome.runtime.getPlatformInfo(function (info) {
+    if (!SUPPORTED_PLATFORMS.includes(info.os)) {
+        console.log("This extension is not supported on", info.os);
+        return;
+    }
+
+    connectHost();
+});
 
 function connectHost() {
     port = chrome.runtime.connectNative("org.kde.plasma.browser_integration");