--- a/browser/base/content/browser-siteIdentity.js
+++ b/browser/base/content/browser-siteIdentity.js
@@ -818,16 +818,17 @@ var gIdentityHandler = {
       } else {
         this._identityBox.classList.add("weakCipher");
       }
     } else if (this._isCertErrorPage) {
       // We show a warning lock icon for certificate errors, and
       // show the "Not Secure" text.
       this._identityBox.className = "certErrorPage notSecureText";
       icon_label = gNavigatorBundle.getString("identity.notSecure.label");
+      tooltip = gNavigatorBundle.getString("identity.notSecure.tooltip");
     } else if (this._isAboutHttpsOnlyErrorPage) {
       // We show a not secure lock icon for 'about:httpsonlyerror' page.
       this._identityBox.className = "httpsOnlyErrorPage";
     } else if (this._isAboutNetErrorPage || this._isAboutBlockedPage) {
       // Network errors and blocked pages get a more neutral icon
       this._identityBox.className = "unknownIdentity";
     } else if (this._isPotentiallyTrustworthy) {
       // This is a local resource (and shouldn't be marked insecure).

--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -756,17 +756,17 @@ toolbar:not(#TabsToolbar) > #personal-bo
 
 /* Customize mode is difficult to use at moderate window width if the Urlbar
    remains 350px wide. */
 :root[customizing] #urlbar-container {
   min-width: 280px;
 }
 
 #identity-icon-box {
-  max-width: calc(30px + 10em);
+  max-width: calc(30px + 13em);
 }
 
 @media (max-width: 770px) {
   #urlbar-container {
     min-width: calc(280px + 24px + 2 * var(--toolbarbutton-inner-padding));
   }
   #nav-bar[downloadsbuttonshown] #urlbar-container {
     min-width: 280px;