diff --git a/remote/shared/RecommendedPreferences.jsm b/remote/shared/RecommendedPreferences.jsm
index 854dd598f5f9..4968a0688a56 100644
--- a/remote/shared/RecommendedPreferences.jsm
+++ b/remote/shared/RecommendedPreferences.jsm
@@ -107,6 +107,9 @@ const COMMON_PREFERENCES = new Map([
   // as it is picked up at runtime.
   ["browser.shell.checkDefaultBrowser", false],
 
+  // Disable session restore infobar
+  ["browser.startup.couldRestoreSession.count", -1],
+
   // Do not redirect user when a milstone upgrade of Firefox is detected
   ["browser.startup.homepage_override.mstone", "ignore"],
 
diff --git a/testing/marionette/client/marionette_driver/geckoinstance.py b/testing/marionette/client/marionette_driver/geckoinstance.py
index 12cb83a6134a..3ec039b50607 100644
--- a/testing/marionette/client/marionette_driver/geckoinstance.py
+++ b/testing/marionette/client/marionette_driver/geckoinstance.py
@@ -587,6 +587,8 @@ class DesktopInstance(GeckoInstance):
         "browser.sessionstore.resume_from_crash": False,
         # Don't check for the default web browser during startup
         "browser.shell.checkDefaultBrowser": False,
+        # Disable session restore infobar
+        "browser.startup.couldRestoreSession.count": -1,
         # Needed for branded builds to prevent opening a second tab on startup
         "browser.startup.homepage_override.mstone": "ignore",
         # Start with a blank page by default
diff --git a/testing/profiles/web-platform/user.js b/testing/profiles/web-platform/user.js
index 6303f5e955d3..f61818055914 100644
--- a/testing/profiles/web-platform/user.js
+++ b/testing/profiles/web-platform/user.js
@@ -8,6 +8,8 @@
 user_pref("browser.newtabpage.enabled", false);
 // Don't restore the last open set of tabs if the browser has crashed
 user_pref("browser.sessionstore.resume_from_crash", false);
+//  Disable session restore infobar.
+user_pref("browser.startup.couldRestoreSession.count", -1);
 // Don't show the Bookmarks Toolbar on any tab (the above pref that
 // disables the New Tab Page ends up showing the toolbar on about:blank).
 user_pref("browser.toolbars.bookmarks.visibility", "never");