diff --git a/browser/components/uitour/UITour-lib.js b/browser/components/uitour/UITour-lib.js
index b225e76a876d..d49449189dec 100644
--- a/browser/components/uitour/UITour-lib.js
+++ b/browser/components/uitour/UITour-lib.js
@@ -556,6 +556,8 @@ if (typeof Mozilla == "undefined") {
    * is a string, begins with "utm_" and contains only only alphanumeric
    * characters, dashes or underscores. The values may be any string and will
    * automatically be encoded.
+   * @param {String} email - A string containing the default email account
+   * for the URL opened by the browser.
    * @since 31, 47 for `extraURLCampaignParams`
    * @example
    * // Will open about:accounts?action=signup&entrypoint=uitour
@@ -567,10 +569,15 @@ if (typeof Mozilla == "undefined") {
    *   'utm_foo': 'bar',
    *   'utm_bar': 'baz'
    * });
+   * @example
+   * // Will open:
+   * // about:accounts?action=signup&entrypoint=uitour&email=foo%40bar.com
+   * Mozilla.UITour.showFirefoxAccounts(null, "foo@bar.com");
    */
-  Mozilla.UITour.showFirefoxAccounts = function(extraURLCampaignParams) {
+  Mozilla.UITour.showFirefoxAccounts = function(extraURLCampaignParams, email) {
     _sendEvent("showFirefoxAccounts", {
       extraURLCampaignParams: JSON.stringify(extraURLCampaignParams),
+      email
     });
   };
 
diff --git a/browser/components/uitour/UITour.jsm b/browser/components/uitour/UITour.jsm
index 3585d141ac6f..ffb45fd2f54b 100644
--- a/browser/components/uitour/UITour.jsm
+++ b/browser/components/uitour/UITour.jsm
@@ -576,6 +576,9 @@ this.UITour = {
           return false;
         }
 
+        if (data.email) {
+          p.append("email", data.email);
+        }
         // We want to replace the current tab.
         browser.loadURI("about:accounts?" + p.toString());
         break;
diff --git a/browser/components/uitour/test/browser_UITour_sync.js b/browser/components/uitour/test/browser_UITour_sync.js
index da8fc2c8b749..2c32c070916a 100644
--- a/browser/components/uitour/test/browser_UITour_sync.js
+++ b/browser/components/uitour/test/browser_UITour_sync.js
@@ -51,17 +51,27 @@ add_UITour_task(async function test_checkSyncCounts() {
 
 // The showFirefoxAccounts API is sync related, so we test that here too...
 add_UITour_task(async function test_firefoxAccountsNoParams() {
+  info("Load about:accounts containing an iframe to https://accounts.firefox.com");
   await gContentAPI.showFirefoxAccounts();
   await BrowserTestUtils.browserLoaded(gTestTab.linkedBrowser, false,
                                        "about:accounts?action=signup&entrypoint=uitour");
 });
 
+
 add_UITour_task(async function test_firefoxAccountsValidParams() {
+  info("Load about:accounts containing an iframe to https://accounts.firefox.com");
   await gContentAPI.showFirefoxAccounts({ utm_foo: "foo", utm_bar: "bar" });
   await BrowserTestUtils.browserLoaded(gTestTab.linkedBrowser, false,
                                        "about:accounts?action=signup&entrypoint=uitour&utm_foo=foo&utm_bar=bar");
 });
 
+add_UITour_task(async function test_firefoxAccountsWithEmail() {
+  info("Load about:accounts containing an iframe to https://accounts.firefox.com");
+  await gContentAPI.showFirefoxAccounts(null, "foo@bar.com");
+  await BrowserTestUtils.browserLoaded(gTestTab.linkedBrowser, false,
+                                       "about:accounts?action=signup&entrypoint=uitour&email=foo%40bar.com");
+});
+
 add_UITour_task(async function test_firefoxAccountsNonAlphaValue() {
   // All characters in the value are allowed, but they must be automatically escaped.
   // (we throw a unicode character in there too - it's not auto-utf8 encoded,
@@ -69,6 +79,7 @@ add_UITour_task(async function test_firefoxAccountsNonAlphaValue() {
   let value = "foo& /=?:\\\xa9";
   // encodeURIComponent encodes spaces to %20 but we want "+"
   let expected = encodeURIComponent(value).replace(/%20/g, "+");
+  info("Load about:accounts containing an iframe to https://accounts.firefox.com");
   await gContentAPI.showFirefoxAccounts({ utm_foo: value });
   await BrowserTestUtils.browserLoaded(gTestTab.linkedBrowser, false,
                                        "about:accounts?action=signup&entrypoint=uitour&utm_foo=" + expected);