diff --git a/x-pack/test/functional/apps/spaces/enter_space.ts b/x-pack/test/functional/apps/spaces/enter_space.ts
index bac4c5a031107..e1dc70b81e146 100644
--- a/x-pack/test/functional/apps/spaces/enter_space.ts
+++ b/x-pack/test/functional/apps/spaces/enter_space.ts
@@ -14,11 +14,8 @@ export default function enterSpaceFunctonalTests({
   const esArchiver = getService('esArchiver');
   const PageObjects = getPageObjects(['security', 'spaceSelector']);
 
-  // FLAKY: https://github.com/elastic/kibana/issues/99879
-  describe.skip('Enter Space', function () {
-    // FLAKY: https://github.com/elastic/kibana/issues/100570
-    // These tests fail very intermittently in Firefox. Skip Firefox testing until resolved.
-    // this.tags('includeFirefox');
+  describe('Enter Space', function () {
+    this.tags('includeFirefox');
     before(async () => {
       await esArchiver.load('x-pack/test/functional/es_archives/spaces/enter_space');
       await PageObjects.security.forceLogout();
diff --git a/x-pack/test/functional/page_objects/space_selector_page.ts b/x-pack/test/functional/page_objects/space_selector_page.ts
index f60da33763240..9e395ce65e36e 100644
--- a/x-pack/test/functional/page_objects/space_selector_page.ts
+++ b/x-pack/test/functional/page_objects/space_selector_page.ts
@@ -48,7 +48,10 @@ export class SpaceSelectorPageObject extends FtrService {
 
   async openSpacesNav() {
     this.log.debug('openSpacesNav()');
-    return await this.testSubjects.click('spacesNavSelector');
+    return await this.retry.try(async () => {
+      await this.testSubjects.click('spacesNavSelector');
+      await this.find.byCssSelector('#headerSpacesMenuContent');
+    });
   }
 
   async clickManageSpaces() {