diff --git a/package.json b/package.json
index 4c712aba76..79570ee1bb 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "main": "index.js",
   "playwright": {
     "chromium_revision": "733125",
-    "firefox_revision": "1016",
+    "firefox_revision": "1017",
     "webkit_revision": "1106"
   },
   "scripts": {
diff --git a/src/firefox/ffNetworkManager.ts b/src/firefox/ffNetworkManager.ts
index 68969eecd8..d16eb456de 100644
--- a/src/firefox/ffNetworkManager.ts
+++ b/src/firefox/ffNetworkManager.ts
@@ -155,7 +155,7 @@ class InterceptableRequest implements network.RequestDelegate {
     for (const {name, value} of payload.headers)
       headers[name.toLowerCase()] = value;
 
-    this.request = new network.Request(payload.suspended ? this : null, frame, redirectChain, payload.navigationId,
+    this.request = new network.Request(payload.isIntercepted ? this : null, frame, redirectChain, payload.navigationId,
         payload.url, causeToResourceType[payload.cause] || 'other', payload.method, payload.postData, headers);
   }
 
@@ -163,23 +163,53 @@ class InterceptableRequest implements network.RequestDelegate {
     const {
       headers,
     } = overrides;
-    await this._session.send('Network.resumeSuspendedRequest', {
+    await this._session.send('Network.resumeInterceptedRequest', {
       requestId: this._id,
-      headers: headers ? Object.entries(headers).filter(([, value]) => !Object.is(value, undefined)).map(([name, value]) => ({name, value})) : undefined,
+      headers: headers ? headersArray(headers) : undefined,
     }).catch(error => {
       debugError(error);
     });
   }
 
   async fulfill(response: { status: number; headers: network.Headers; contentType: string; body: (string | platform.BufferType); }) {
-    throw new Error('Fulfill is not supported in Firefox');
+    const responseBody = response.body && helper.isString(response.body) ? platform.Buffer.from(response.body) : (response.body || null);
+
+    const responseHeaders: { [s: string]: string; } = {};
+    if (response.headers) {
+      for (const header of Object.keys(response.headers))
+        responseHeaders[header.toLowerCase()] = response.headers[header];
+    }
+    if (response.contentType)
+      responseHeaders['content-type'] = response.contentType;
+    if (responseBody && !('content-length' in responseHeaders))
+      responseHeaders['content-length'] = String(platform.Buffer.byteLength(responseBody));
+
+    await this._session.send('Network.fulfillInterceptedRequest', {
+      requestId: this._id,
+      status: response.status || 200,
+      statusText: network.STATUS_TEXTS[String(response.status || 200)] || '',
+      headers: headersArray(responseHeaders),
+      base64body: responseBody ? responseBody.toString('base64') : undefined,
+    }).catch(error => {
+      debugError(error);
+    });
   }
 
-  async abort() {
-    await this._session.send('Network.abortSuspendedRequest', {
+  async abort(errorCode: string) {
+    await this._session.send('Network.abortInterceptedRequest', {
       requestId: this._id,
+      errorCode,
     }).catch(error => {
       debugError(error);
     });
   }
 }
+
+function headersArray(headers: network.Headers): Protocol.Network.HTTPHeader[] {
+  const result: Protocol.Network.HTTPHeader[] = [];
+  for (const name in headers) {
+    if (!Object.is(headers[name], undefined))
+      result.push({name, value: headers[name] + ''});
+  }
+  return result;
+}
diff --git a/src/firefox/ffPage.ts b/src/firefox/ffPage.ts
index 32c836bf79..8e9650d03c 100644
--- a/src/firefox/ffPage.ts
+++ b/src/firefox/ffPage.ts
@@ -294,8 +294,8 @@ export class FFPage implements PageDelegate {
     throw new Error('Offline mode not implemented in Firefox');
   }
 
-  async authenticate(credentials: types.Credentials): Promise<void> {
-    throw new Error('Offline mode not implemented in Firefox');
+  async authenticate(credentials: types.Credentials | null): Promise<void> {
+    await this._session.send('Network.setAuthCredentials', credentials || { username: null, password: null });
   }
 
   async reload(): Promise<void> {
diff --git a/test/golden-firefox/mock-binary-response.png b/test/golden-firefox/mock-binary-response.png
new file mode 100644
index 0000000000..be9f4a4468
Binary files /dev/null and b/test/golden-firefox/mock-binary-response.png differ
diff --git a/test/interception.spec.js b/test/interception.spec.js
index a347113151..1cb70b3455 100644
--- a/test/interception.spec.js
+++ b/test/interception.spec.js
@@ -178,7 +178,7 @@ module.exports.describe = function({testRunner, expect, defaultBrowserOptions, p
       if (WEBKIT)
         expect(failedRequest.failure().errorText).toBe('Request intercepted');
       else if (FFOX)
-        expect(failedRequest.failure().errorText).toBe('NS_ERROR_FAILURE');
+        expect(failedRequest.failure().errorText).toBe('NS_ERROR_OFFLINE');
       else
         expect(failedRequest.failure().errorText).toBe('net::ERR_INTERNET_DISCONNECTED');
     });
@@ -438,7 +438,7 @@ module.exports.describe = function({testRunner, expect, defaultBrowserOptions, p
     });
   });
 
-  describe.skip(FFOX)('interception.fulfill', function() {
+  describe('interception.fulfill', function() {
     it('should work', async({page, server}) => {
       await page.setRequestInterception(true);
       page.on('request', request => {
@@ -506,7 +506,7 @@ module.exports.describe = function({testRunner, expect, defaultBrowserOptions, p
     });
   });
 
-  describe.skip(FFOX)('Interception.authenticate', function() {
+  describe('Page.authenticate', function() {
     it('should work', async({page, server}) => {
       server.setAuth('/empty.html', 'user', 'pass');
       let response = await page.goto(server.EMPTY_PAGE);