diff --git a/experimental/puppeteer-firefox/lib/NetworkManager.js b/experimental/puppeteer-firefox/lib/NetworkManager.js
index df134e9c654..19997545646 100644
--- a/experimental/puppeteer-firefox/lib/NetworkManager.js
+++ b/experimental/puppeteer-firefox/lib/NetworkManager.js
@@ -27,6 +27,15 @@ class NetworkManager extends EventEmitter {
     this._frameManager = frameManager;
   }
 
+  async setExtraHTTPHeaders(headers) {
+    const array = [];
+    for (const [name, value] of Object.entries(headers)) {
+      assert(helper.isString(value), `Expected value of header "${name}" to be String, but "${typeof value}" is found.`);
+      array.push({name, value});
+    }
+    await this._session.send('Network.setExtraHTTPHeaders', {headers: array});
+  }
+
   async setRequestInterception(enabled) {
     await this._session.send('Network.setRequestInterception', {enabled});
   }
diff --git a/experimental/puppeteer-firefox/lib/Page.js b/experimental/puppeteer-firefox/lib/Page.js
index 1e7e1665c53..8bcd4009810 100644
--- a/experimental/puppeteer-firefox/lib/Page.js
+++ b/experimental/puppeteer-firefox/lib/Page.js
@@ -77,6 +77,10 @@ class Page extends EventEmitter {
     await this._networkManager.setRequestInterception(enabled);
   }
 
+  async setExtraHTTPHeaders(headers) {
+    await this._networkManager.setExtraHTTPHeaders(headers);
+  }
+
   /**
    * @param {(string|Function)} urlOrPredicate
    * @param {!{timeout?: number}=} options
diff --git a/experimental/puppeteer-firefox/package.json b/experimental/puppeteer-firefox/package.json
index 745f28a2a31..0dd0e9749b1 100644
--- a/experimental/puppeteer-firefox/package.json
+++ b/experimental/puppeteer-firefox/package.json
@@ -9,7 +9,7 @@
     "node": ">=8.9.4"
   },
   "puppeteer": {
-    "firefox_revision": "98116977b3f0c936c92e917bdd571c340167a536"
+    "firefox_revision": "e78e4cefab9d40e70bb80b3e649dcba7a7c8ee8f"
   },
   "scripts": {
     "install": "node install.js",
diff --git a/test/network.spec.js b/test/network.spec.js
index 0753cd7b3a2..d024d3ce4b7 100644
--- a/test/network.spec.js
+++ b/test/network.spec.js
@@ -429,7 +429,7 @@ module.exports.addTests = function({testRunner, expect, CHROME}) {
       await page.setRequestInterception(false);
       await page.goto(server.EMPTY_PAGE);
     });
-    it_fails_ffox('should show custom HTTP headers', async({page, server}) => {
+    it('should show custom HTTP headers', async({page, server}) => {
       await page.setExtraHTTPHeaders({
         foo: 'bar'
       });
@@ -441,7 +441,7 @@ module.exports.addTests = function({testRunner, expect, CHROME}) {
       const response = await page.goto(server.EMPTY_PAGE);
       expect(response.ok()).toBe(true);
     });
-    it_fails_ffox('should works with customizing referer headers', async({page, server}) => {
+    it('should works with customizing referer headers', async({page, server}) => {
       await page.setExtraHTTPHeaders({ 'referer': server.EMPTY_PAGE });
       await page.setRequestInterception(true);
       page.on('request', request => {
@@ -477,7 +477,7 @@ module.exports.addTests = function({testRunner, expect, CHROME}) {
       expect(failedRequest).toBeTruthy();
       expect(failedRequest.failure().errorText).toBe('net::ERR_INTERNET_DISCONNECTED');
     });
-    it_fails_ffox('should send referer', async({page, server}) => {
+    it('should send referer', async({page, server}) => {
       await page.setExtraHTTPHeaders({
         referer: 'http://google.com/'
       });
@@ -744,7 +744,7 @@ module.exports.addTests = function({testRunner, expect, CHROME}) {
     });
   });
 
-  describe_fails_ffox('Page.setExtraHTTPHeaders', function() {
+  describe('Page.setExtraHTTPHeaders', function() {
     it('should work', async({page, server}) => {
       await page.setExtraHTTPHeaders({
         foo: 'bar'