Bug 1383495 - Spoof Navigator API platform as win64 when resisting fingerprinting is enabled. r=ehsan

browser/components/resistfingerprinting/test/browser/browser_navigator.js

@@ -12,7 +12,7 @@ var spoofedUserAgent;
 
 const SPOOFED_APPNAME        = "Netscape";
 const SPOOFED_APPVERSION     = "5.0 (Windows)";
-const SPOOFED_PLATFORM       = "Win32";
+const SPOOFED_PLATFORM       = "Win64";
 const SPOOFED_OSCPU          = "Windows NT 6.1";
 const SPOOFED_BUILDID        = "20100101";
 const SPOOFED_HW_CONCURRENCY = 2;

netwerk/protocol/http/nsHttpHandler.cpp

@@ -455,9 +455,10 @@ nsHttpHandler::Init()
         mAppVersion.AssignLiteral(MOZ_APP_UA_VERSION);
     }
 
-    // Generating the spoofed userAgent for fingerprinting resistance. We will
-    // round the version to the nearest 10. By doing so, the anonymity group will
-    // cover more versions instead of one version.
+    // Generating the spoofed userAgent for fingerprinting resistance.
+    // The browser version will be rounded down to a multiple of 10.
+    // By doing so, the anonymity group will cover more versions instead of one
+    // version.
     uint32_t spoofedVersion = mAppVersion.ToInteger(&rv);
     if (NS_SUCCEEDED(rv)) {
         spoofedVersion = spoofedVersion - (spoofedVersion % 10);

toolkit/components/resistfingerprinting/nsRFPService.h

@@ -16,7 +16,7 @@
 #define SPOOFED_APPNAME    "Netscape"
 #define SPOOFED_APPVERSION "5.0 (Windows)"
 #define SPOOFED_OSCPU      "Windows NT 6.1"
-#define SPOOFED_PLATFORM   "Win32"
+#define SPOOFED_PLATFORM   "Win64"
 
 #define LEGACY_BUILD_ID    "20100101"