--- a/browser/extensions/formautofill/content/manageDialog.css
+++ b/browser/extensions/formautofill/content/manageDialog.css
@@ -1,12 +1,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+html {
+  /* Prevent unnecessary horizontal scroll bar from showing */
+  overflow-x: hidden;
+}
+
 div {
   display: flex;
 }
 
 fieldset {
   margin: 0;
   padding: 0;
   border: none;

--- a/browser/extensions/formautofill/content/manageDialog.js
+++ b/browser/extensions/formautofill/content/manageDialog.js
@@ -44,17 +44,17 @@ class ManageRecords {
 
   uninit() {
     log.debug("uninit");
     this.detachEventListeners();
     this._elements = null;
   }
 
   localizeDocument() {
-    document.documentElement.style.width = FormAutofillUtils.stringBundle.GetStringFromName("manageDialogsWidth");
+    document.documentElement.style.minWidth = FormAutofillUtils.stringBundle.GetStringFromName("manageDialogsWidth");
     FormAutofillUtils.localizeMarkup(AUTOFILL_BUNDLE_URI, document);
   }
 
   /**
    * Get the selected options on the addresses element.
    *
    * @returns {array<DOMElement>}
    */