diff --git a/web-extensions/resources/runtime/background.js b/web-extensions/resources/runtime/background.js
index 0426ed8f3de27d..01fcd44f3e38b1 100644
--- a/web-extensions/resources/runtime/background.js
+++ b/web-extensions/resources/runtime/background.js
@@ -1,30 +1,41 @@
 browser.test.runTests([
-    function browserRuntimeGetURLErrorCases() {
-        browser.test.assertThrows(() => browser.runtime.getURL())
-        browser.test.assertThrows(() => browser.runtime.getURL(null))
-        browser.test.assertThrows(() => browser.runtime.getURL(undefined))
-        browser.test.assertThrows(() => browser.runtime.getURL(42))
-        browser.test.assertThrows(() => browser.runtime.getURL(/test/))
-    },
-    function browserRuntimeGetURLNormalCases() {
-        browser.test.assertEq(typeof browser.runtime.getURL(""), "string")
-        browser.test.assertEq(new URL(browser.runtime.getURL("")).pathname, "/")
-        browser.test.assertEq(new URL(browser.runtime.getURL("test.js")).pathname, "/test.js")
-        browser.test.assertEq(new URL(browser.runtime.getURL("/test.js")).pathname, "/test.js")
-        browser.test.assertEq(new URL(browser.runtime.getURL("../../test.js")).pathname, "/test.js")
-        browser.test.assertEq(new URL(browser.runtime.getURL("./test.js")).pathname, "/test.js")
-        browser.test.assertEq(new URL(browser.runtime.getURL("././/example")).pathname, "//example")
-        browser.test.assertEq(new URL(browser.runtime.getURL("../../example/..//test/")).pathname, "//test/")
-        browser.test.assertEq(new URL(browser.runtime.getURL(".")).pathname, "/")
-        browser.test.assertEq(new URL(browser.runtime.getURL("..//../")).pathname, "/")
-        browser.test.assertEq(new URL(browser.runtime.getURL(".././..")).pathname, "/")
-        browser.test.assertEq(new URL(browser.runtime.getURL("/.././.")).pathname, "/")
-    },
-    async function browserRuntimeGetPlatformInfo() {
-        const platformInfo = await browser.runtime.getPlatformInfo()
+  function browserRuntimeGetURLErrorCases() {
+    browser.test.assertThrows(() => browser.runtime.getURL());
+    browser.test.assertThrows(() => browser.runtime.getURL(null));
+    browser.test.assertThrows(() => browser.runtime.getURL(undefined));
+    browser.test.assertThrows(() => browser.runtime.getURL(42));
+    browser.test.assertThrows(() => browser.runtime.getURL(/test/));
+  },
+  function browserRuntimeGetURLNormalCases() {
+    browser.test.assertEq(typeof browser.runtime.getURL(""), "string");
+    browser.test.assertEq(new URL(browser.runtime.getURL("")).pathname, "/");
+    browser.test.assertEq(new URL(browser.runtime.getURL("test.js")).pathname, "/test.js");
+    browser.test.assertEq(new URL(browser.runtime.getURL("/test.js")).pathname, "/test.js");
+    browser.test.assertEq(new URL(browser.runtime.getURL("../../test.js")).pathname, "/test.js");
+    browser.test.assertEq(new URL(browser.runtime.getURL("./test.js")).pathname, "/test.js");
+    browser.test.assertEq(new URL(browser.runtime.getURL("././/example")).pathname, "//example");
+    browser.test.assertEq(new URL(browser.runtime.getURL("../../example/..//test/")).pathname, "//test/");
+    browser.test.assertEq(new URL(browser.runtime.getURL(".")).pathname, "/");
+    browser.test.assertEq(new URL(browser.runtime.getURL("..//../")).pathname, "/");
+    browser.test.assertEq(new URL(browser.runtime.getURL(".././..")).pathname, "/");
+    browser.test.assertEq(new URL(browser.runtime.getURL("/.././.")).pathname, "/");
+  },
+  async function browserRuntimeGetPlatformInfo() {
+    const platformInfo = await browser.runtime.getPlatformInfo();
 
-        browser.test.assertEq(typeof platformInfo, "object")
-        browser.test.assertEq(typeof platformInfo.os, "string")
-        browser.test.assertEq(typeof platformInfo.arch, "string")
+    browser.test.assertEq(typeof platformInfo, "object");
+    browser.test.assertEq(typeof platformInfo.os, "string");
+    browser.test.assertEq(typeof platformInfo.arch, "string");
+  },
+  async function browserRuntimeGetVersion() {
+    const version = browser.runtime.getVersion();
+    browser.test.assertEq(typeof version, "string");
+    // Implementations are free on how they interpret the version number.
+    // However, they need to be consistent in APIs (like the management API).
+    browser.test.assertTrue(version === "1.01" || version === "1.1");
+    if (browser.management && browser.management.getSelf) {
+      const extensionInfo = await browser.management.getSelf();
+      browser.test.assertEq(version, extensionInfo.version);
     }
-])
+  }
+]);
diff --git a/web-extensions/resources/runtime/manifest.json b/web-extensions/resources/runtime/manifest.json
index 1bd0f0fcbb3d01..42b82c5b402a79 100644
--- a/web-extensions/resources/runtime/manifest.json
+++ b/web-extensions/resources/runtime/manifest.json
@@ -2,10 +2,13 @@
     "manifest_version": 3,
     "name": "BrowserRuntimeTestExtension",
     "description": "browser.runtime test extension",
-    "version": "1.0",
+    "version": "1.01",
     "background": {
         "scripts": [ "background.js" ],
         "service_worker": "background.js",
         "type": "module"
-    }
+    },
+    "permissions": [
+        "management"
+    ]
 }