diff --git a/package.json b/package.json
index 38f4dd2784..9897b58043 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "main": "index.js",
   "playwright": {
     "chromium_revision": "751710",
-    "firefox_revision": "1049",
+    "firefox_revision": "1050",
     "webkit_revision": "1182"
   },
   "scripts": {
diff --git a/src/firefox/ffBrowser.ts b/src/firefox/ffBrowser.ts
index 7a2e67879b..5cd1220df8 100644
--- a/src/firefox/ffBrowser.ts
+++ b/src/firefox/ffBrowser.ts
@@ -288,7 +288,7 @@ export class FFBrowserContext extends BrowserContextBase {
       throw new Error(`Function "${name}" has been already registered`);
     const binding = new PageBinding(name, playwrightFunction);
     this._pageBindings.set(name, binding);
-    throw new Error('Not implemented');
+    await this._browser._connection.send('Browser.addBinding', { browserContextId: this._browserContextId || undefined, name, script: binding.source });
   }
 
   async route(url: types.URLMatch, handler: network.RouteHandler): Promise<void> {
diff --git a/src/firefox/ffPage.ts b/src/firefox/ffPage.ts
index c95c30eba8..68dc1893ee 100644
--- a/src/firefox/ffPage.ts
+++ b/src/firefox/ffPage.ts
@@ -266,9 +266,7 @@ export class FFPage implements PageDelegate {
   }
 
   async exposeBinding(binding: PageBinding) {
-    await this._session.send('Page.addBinding', {name: binding.name});
-    await this._session.send('Page.addScriptToEvaluateOnNewDocument', {script: binding.source});
-    await Promise.all(this._page.frames().map(frame => frame.evaluate(binding.source).catch(debugError)));
+    await this._session.send('Page.addBinding', { name: binding.name, script: binding.source });
   }
 
   didClose() {
diff --git a/test/browsercontext.spec.js b/test/browsercontext.spec.js
index 4ccc3a81b2..7e9ae9d716 100644
--- a/test/browsercontext.spec.js
+++ b/test/browsercontext.spec.js
@@ -326,7 +326,7 @@ module.exports.describe = function({testRunner, expect, playwright, CHROMIUM, FF
   });
 
   describe('BrowserContext.exposeFunction', () => {
-    it.fail(FFOX)('should work', async({browser, server}) => {
+    it('should work', async({browser, server}) => {
       const context = await browser.newContext();
       await context.exposeFunction('add', (a, b) => a + b);
       const page = await context.newPage();
@@ -337,7 +337,7 @@ module.exports.describe = function({testRunner, expect, playwright, CHROMIUM, FF
       expect(result).toEqual({ mul: 36, add: 13 });
       await context.close();
     });
-    it.fail(FFOX)('should throw for duplicate registrations', async({browser, server}) => {
+    it('should throw for duplicate registrations', async({browser, server}) => {
       const context = await browser.newContext();
       await context.exposeFunction('foo', () => {});
       await context.exposeFunction('bar', () => {});
@@ -351,7 +351,7 @@ module.exports.describe = function({testRunner, expect, playwright, CHROMIUM, FF
       expect(error.message).toBe('Function "baz" has been already registered in one of the pages');
       await context.close();
     });
-    it.fail(FFOX)('should be callable from-inside addInitScript', async({browser, server}) => {
+    it('should be callable from-inside addInitScript', async({browser, server}) => {
       const context = await browser.newContext();
       let args = [];
       await context.exposeFunction('woof', function(arg) {
diff --git a/test/popup.spec.js b/test/popup.spec.js
index 349dae590c..75dd5edce8 100644
--- a/test/popup.spec.js
+++ b/test/popup.spec.js
@@ -166,7 +166,7 @@ module.exports.describe = function({testRunner, expect, playwright, CHROMIUM, WE
       await context.close();
       expect(injected).toBe(123);
     });
-    it.fail(FFOX)('should expose function from browser context', async function({browser, server}) {
+    it('should expose function from browser context', async function({browser, server}) {
       const context = await browser.newContext();
       await context.exposeFunction('add', (a, b) => a + b);
       const page = await context.newPage();