diff --git a/CLOBBER b/CLOBBER
index d4cdfaff33de..2cdfae55cfeb 100644
--- a/CLOBBER
+++ b/CLOBBER
@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Merge day clobber
\ No newline at end of file
+Bug 1280590 - xpcshell failure in windows7
diff --git a/browser/components/sessionstore/SessionCookies.jsm b/browser/components/sessionstore/SessionCookies.jsm
index 01da2bbc92d0..347ebdbf1a56 100644
--- a/browser/components/sessionstore/SessionCookies.jsm
+++ b/browser/components/sessionstore/SessionCookies.jsm
@@ -115,6 +115,7 @@ var SessionCookiesInternal = {
    * Restores a given list of session cookies.
    */
   restore(cookies) {
+
     for (let cookie of cookies) {
       let expiry = "expiry" in cookie ? cookie.expiry : MAX_EXPIRY;
       let cookieObj = {
@@ -122,7 +123,7 @@ var SessionCookiesInternal = {
         path: cookie.path || "",
         name: cookie.name || ""
       };
-      if (!Services.cookies.cookieExists(cookieObj)) {
+      if (!Services.cookies.cookieExists(cookieObj, cookie.originAttributes || {})) {
         Services.cookies.add(cookie.host, cookie.path || "", cookie.name || "",
                              cookie.value, !!cookie.secure, !!cookie.httponly,
                              /* isSession = */ true, expiry, cookie.originAttributes || {});
diff --git a/netwerk/cookie/nsCookieService.cpp b/netwerk/cookie/nsCookieService.cpp
index cc97c19daa8a..b867c4ab21df 100644
--- a/netwerk/cookie/nsCookieService.cpp
+++ b/netwerk/cookie/nsCookieService.cpp
@@ -4356,10 +4356,42 @@ nsCookieService::PurgeCookies(int64_t aCurrentTimeInUsec)
 // find whether a given cookie has been previously set. this is provided by the
 // nsICookieManager2 interface.
 NS_IMETHODIMP
-nsCookieService::CookieExists(nsICookie2 *aCookie,
-                              bool       *aFoundCookie)
+nsCookieService::CookieExists(nsICookie2* aCookie,
+                              JS::HandleValue aOriginAttributes,
+                              JSContext* aCx,
+                              uint8_t aArgc,
+                              bool* aFoundCookie)
 {
   NS_ENSURE_ARG_POINTER(aCookie);
+  NS_ENSURE_ARG_POINTER(aCx);
+  NS_ENSURE_ARG_POINTER(aFoundCookie);
+
+  MOZ_ASSERT(aArgc == 0 || aArgc == 1);
+
+  nsresult rv;
+  NeckoOriginAttributes attrs;
+
+  if (aArgc == 1) {
+    rv = InitializeOriginAttributes(&attrs,
+                                    aOriginAttributes,
+                                    aCx,
+                                    aArgc,
+                                    u"nsICookieManager2.cookieExists()",
+                                    u"2");
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return CookieExistsNative(aCookie, &attrs, aFoundCookie);
+}
+
+NS_IMETHODIMP_(nsresult)
+nsCookieService::CookieExistsNative(nsICookie2* aCookie,
+                                    NeckoOriginAttributes* aOriginAttributes,
+                                    bool* aFoundCookie)
+{
+  NS_ENSURE_ARG_POINTER(aCookie);
+  NS_ENSURE_ARG_POINTER(aOriginAttributes);
+  NS_ENSURE_ARG_POINTER(aFoundCookie);
 
   if (!mDBState) {
     NS_WARNING("No DBState! Profile already closed?");
@@ -4379,7 +4411,8 @@ nsCookieService::CookieExists(nsICookie2 *aCookie,
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsListIter iter;
-  *aFoundCookie = FindCookie(DEFAULT_APP_KEY(baseDomain), host, name, path, iter);
+  *aFoundCookie = FindCookie(nsCookieKey(baseDomain, *aOriginAttributes),
+                             host, name, path, iter);
   return NS_OK;
 }
 
diff --git a/netwerk/cookie/nsICookieManager2.idl b/netwerk/cookie/nsICookieManager2.idl
index 98071890d408..f20618bfae91 100644
--- a/netwerk/cookie/nsICookieManager2.idl
+++ b/netwerk/cookie/nsICookieManager2.idl
@@ -76,11 +76,23 @@ interface nsICookieManager2 : nsICookieManager
    *
    * @param aCookie
    *        the cookie to look for
+   * @param aOriginAttributes
+   *        nsICookie2 contains an originAttributes but if nsICookie2 is
+   *        implemented in JS, we can't retrieve its originAttributes because
+   *        the getter is marked [implicit_jscontext]. This optional parameter
+   *        is a workaround.
    *
    * @return true if a cookie was found which matches the host, path, and name
    *         fields of aCookie
    */
-  boolean cookieExists(in nsICookie2 aCookie);
+  [implicit_jscontext, optional_argc]
+  boolean cookieExists(in nsICookie2 aCookie,
+                       [optional] in jsval aOriginAttributes);
+
+  [notxpcom]
+  nsresult cookieExistsNative(in nsICookie2 aCookie,
+                              in NeckoOriginAttributesPtr aOriginAttributes,
+                              out boolean aExists);
 
   /**
    * Count how many cookies exist within the base domain of 'aHost'.
diff --git a/netwerk/test/TestCookie.cpp b/netwerk/test/TestCookie.cpp
index 513ed77ce824..f1b259c2c985 100644
--- a/netwerk/test/TestCookie.cpp
+++ b/netwerk/test/TestCookie.cpp
@@ -757,9 +757,9 @@ main(int32_t argc, char *argv[])
       uint32_t hostCookies = 0;
       rv[8] = NS_SUCCEEDED(cookieMgr2->CountCookiesFromHost(NS_LITERAL_CSTRING("cookiemgr.test"), &hostCookies)) &&
               hostCookies == 2;
-      // check CookieExists() using the third cookie
+      // check CookieExistsNative() using the third cookie
       bool found;
-      rv[9] = NS_SUCCEEDED(cookieMgr2->CookieExists(newDomainCookie, &found)) && found;
+      rv[9] = NS_SUCCEEDED(cookieMgr2->CookieExistsNative(newDomainCookie, &attrs,  &found)) && found;
 
 
       // remove the cookie, block it, and ensure it can't be added again
@@ -768,7 +768,7 @@ main(int32_t argc, char *argv[])
                                                     NS_LITERAL_CSTRING("/rabbit"),    // path
                                                     true,                             // is blocked
                                                     &attrs));                         // originAttributes
-      rv[11] = NS_SUCCEEDED(cookieMgr2->CookieExists(newDomainCookie, &found)) && !found;
+      rv[11] = NS_SUCCEEDED(cookieMgr2->CookieExistsNative(newDomainCookie, &attrs, &found)) && !found;
       rv[12] = NS_SUCCEEDED(cookieMgr2->AddNative(NS_LITERAL_CSTRING("new.domain"),     // domain
                                             NS_LITERAL_CSTRING("/rabbit"),        // path
                                             NS_LITERAL_CSTRING("test3"),          // name
@@ -778,14 +778,14 @@ main(int32_t argc, char *argv[])
                                             true,                              // is session
                                             INT64_MIN,                            // expiry time
                                             &attrs));                         // originAttributes
-      rv[13] = NS_SUCCEEDED(cookieMgr2->CookieExists(newDomainCookie, &found)) && !found;
+      rv[13] = NS_SUCCEEDED(cookieMgr2->CookieExistsNative(newDomainCookie, &attrs, &found)) && !found;
       // sleep four seconds, to make sure the second cookie has expired
       PR_Sleep(4 * PR_TicksPerSecond());
-      // check that both CountCookiesFromHost() and CookieExists() count the
+      // check that both CountCookiesFromHost() and CookieExistsNative() count the
       // expired cookie
       rv[14] = NS_SUCCEEDED(cookieMgr2->CountCookiesFromHost(NS_LITERAL_CSTRING("cookiemgr.test"), &hostCookies)) &&
               hostCookies == 2;
-      rv[15] = NS_SUCCEEDED(cookieMgr2->CookieExists(expiredCookie, &found)) && found;
+      rv[15] = NS_SUCCEEDED(cookieMgr2->CookieExistsNative(expiredCookie, &attrs, &found)) && found;
       // double-check RemoveAll() using the enumerator
       rv[16] = NS_SUCCEEDED(cookieMgr->RemoveAll());
       rv[17] = NS_SUCCEEDED(cookieMgr->GetEnumerator(getter_AddRefs(enumerator))) &&