diff --git a/browser/base/content/browser-siteIdentity.js b/browser/base/content/browser-siteIdentity.js
index 4efbba2324..a35021b0c6 100644
--- a/browser/base/content/browser-siteIdentity.js
+++ b/browser/base/content/browser-siteIdentity.js
@@ -414,6 +414,35 @@ var gIdentityHandler = {
     event.stopPropagation();
   },
 
+  /**
+   * Handles clicks on the "ALLOW Cookies and Site Data" button.
+   */
+  async allowSiteData(event) {
+    // Hide the popup before showing the removal prompt, to
+    // avoid a pretty ugly transition. Also hide it even
+    // if the update resulted in no site data, to keep the
+    // illusion that clicking the button had an effect.
+    let hidden = new Promise(c => {
+      this._identityPopup.addEventListener("popuphidden", c, { once: true });
+    });
+    PanelMultiView.hidePopup(this._identityPopup);
+    await hidden;
+
+    // Get base domain
+    if (!this._uriHasHost) { return }
+    let baseDomain = SiteDataManager.getBaseDomainFromHost(this._uri.host);
+
+    // Set variables and call addFromPrincipal()
+    const type = 'cookie';
+    const capability = Ci.nsIPermissionManager.ALLOW_ACTION;
+    let uri = Services.io.newURI('https://' + baseDomain);
+    let principal = Services.scriptSecurityManager.createContentPrincipal(uri,{});
+    Services.perms.addFromPrincipal(principal, type, capability);
+
+    // Stop propagating the event and exit.
+    event.stopPropagation();
+  },
+
   /**
    * Handler for mouseclicks on the "More Information" button in the
    * "identity-popup" panel.
diff --git a/browser/components/controlcenter/content/identityPanel.inc.xhtml b/browser/components/controlcenter/content/identityPanel.inc.xhtml
index 8bc64faa1e..0768ff1520 100644
--- a/browser/components/controlcenter/content/identityPanel.inc.xhtml
+++ b/browser/components/controlcenter/content/identityPanel.inc.xhtml
@@ -96,6 +96,10 @@
                 data-l10n-id="identity-clear-site-data"
                 class="subviewbutton"
                 oncommand="gIdentityHandler.clearSiteData(event);"/>
+        <toolbarbutton id="identity-popup-allow-sitedata-button"
+                data-l10n-id="identity-allow-site-data"
+                class="subviewbutton"
+                oncommand="gIdentityHandler.allowSiteData(event);"/>
       </vbox>
     </panelview>
 
diff --git a/browser/locales/en-US/browser/browser.ftl b/browser/locales/en-US/browser/browser.ftl
index 0dbdc78eda..3ced42d39f 100644
--- a/browser/locales/en-US/browser/browser.ftl
+++ b/browser/locales/en-US/browser/browser.ftl
@@ -402,6 +402,8 @@ identity-permissions-storage-access-learn-more = Learn more
 identity-permissions-reload-hint = You may need to reload the page for changes to apply.
 identity-clear-site-data =
     .label = Clear cookies and site data…
+identity-allow-site-data =
+    .label = Allow cookies etc. (Save login info)
 identity-connection-not-secure-security-view = You are not securely connected to this site.
 identity-connection-verified = You are securely connected to this site.
 identity-ev-owner-label = Certificate issued to: