diff --git a/browsers.json b/browsers.json
index c6f12b95f7..30b8166543 100644
--- a/browsers.json
+++ b/browsers.json
@@ -8,7 +8,7 @@
     },
     {
       "name": "firefox",
-      "revision": "1205",
+      "revision": "1206",
       "download": true
     },
     {
diff --git a/test/network-request.spec.ts b/test/network-request.spec.ts
index 3310bcbeff..6e24d4732d 100644
--- a/test/network-request.spec.ts
+++ b/test/network-request.spec.ts
@@ -154,9 +154,7 @@ it('should work with binary post data and interception', async ({page, server})
     expect(buffer[i]).toBe(i);
 });
 
-it('should override post data content type', (test, { browserName }) => {
-  test.fixme(browserName === 'firefox', 'Always reports application/octet-stream');
-}, async ({page, server}) => {
+it('should override post data content type', async ({page, server}) => {
   await page.goto(server.EMPTY_PAGE);
   let request = null;
   server.setRoute('/post', (req, res) => {