diff --git a/browsers.json b/browsers.json
index 331b6b2232..86880ad901 100644
--- a/browsers.json
+++ b/browsers.json
@@ -13,7 +13,7 @@
     },
     {
       "name": "firefox",
-      "revision": "1285",
+      "revision": "1288",
       "installByDefault": true
     },
     {
diff --git a/src/server/firefox/protocol.d.ts b/src/server/firefox/protocol.d.ts
index 34a3667aab..8c080fa125 100644
--- a/src/server/firefox/protocol.d.ts
+++ b/src/server/firefox/protocol.d.ts
@@ -149,6 +149,11 @@ export module Protocol {
       userAgent: string|null;
     };
     export type setUserAgentOverrideReturnValue = void;
+    export type setPlatformOverrideParameters = {
+      browserContextId?: string;
+      platform: string|null;
+    };
+    export type setPlatformOverrideReturnValue = void;
     export type setBypassCSPParameters = {
       browserContextId?: string;
       bypassCSP: boolean|null;
@@ -645,6 +650,15 @@ export module Protocol {
       buttons: number;
     };
     export type dispatchMouseEventReturnValue = void;
+    export type dispatchWheelEventParameters = {
+      x: number;
+      y: number;
+      deltaX: number;
+      deltaY: number;
+      deltaZ: number;
+      modifiers: number;
+    };
+    export type dispatchWheelEventReturnValue = void;
     export type insertTextParameters = {
       text: string;
     };
@@ -1079,6 +1093,7 @@ export module Protocol {
     "Browser.setRequestInterception": Browser.setRequestInterceptionParameters;
     "Browser.setGeolocationOverride": Browser.setGeolocationOverrideParameters;
     "Browser.setUserAgentOverride": Browser.setUserAgentOverrideParameters;
+    "Browser.setPlatformOverride": Browser.setPlatformOverrideParameters;
     "Browser.setBypassCSP": Browser.setBypassCSPParameters;
     "Browser.setIgnoreHTTPSErrors": Browser.setIgnoreHTTPSErrorsParameters;
     "Browser.setJavaScriptDisabled": Browser.setJavaScriptDisabledParameters;
@@ -1122,6 +1137,7 @@ export module Protocol {
     "Page.dispatchTouchEvent": Page.dispatchTouchEventParameters;
     "Page.dispatchTapEvent": Page.dispatchTapEventParameters;
     "Page.dispatchMouseEvent": Page.dispatchMouseEventParameters;
+    "Page.dispatchWheelEvent": Page.dispatchWheelEventParameters;
     "Page.insertText": Page.insertTextParameters;
     "Page.crash": Page.crashParameters;
     "Page.handleDialog": Page.handleDialogParameters;
@@ -1156,6 +1172,7 @@ export module Protocol {
     "Browser.setRequestInterception": Browser.setRequestInterceptionReturnValue;
     "Browser.setGeolocationOverride": Browser.setGeolocationOverrideReturnValue;
     "Browser.setUserAgentOverride": Browser.setUserAgentOverrideReturnValue;
+    "Browser.setPlatformOverride": Browser.setPlatformOverrideReturnValue;
     "Browser.setBypassCSP": Browser.setBypassCSPReturnValue;
     "Browser.setIgnoreHTTPSErrors": Browser.setIgnoreHTTPSErrorsReturnValue;
     "Browser.setJavaScriptDisabled": Browser.setJavaScriptDisabledReturnValue;
@@ -1199,6 +1216,7 @@ export module Protocol {
     "Page.dispatchTouchEvent": Page.dispatchTouchEventReturnValue;
     "Page.dispatchTapEvent": Page.dispatchTapEventReturnValue;
     "Page.dispatchMouseEvent": Page.dispatchMouseEventReturnValue;
+    "Page.dispatchWheelEvent": Page.dispatchWheelEventReturnValue;
     "Page.insertText": Page.insertTextReturnValue;
     "Page.crash": Page.crashReturnValue;
     "Page.handleDialog": Page.handleDialogReturnValue;