Noissue - Adapt check for devtools panel support for Firefox

skin/mobile-options.css

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 60 matching lines @@
   line-height: 20px;
   color: #000;
 }
 
 h1::before
 {
   position: absolute;
   left: -25px;
   width: 20px;
   height: 20px;
-  background: url(mobile/abp-logo.svg) 0/20px;
+  background-image: url(abp-logo.svg);
   content: "";
 }
 
 html[dir="rtl"] h1::before
 {
   left: auto;
   right: -25px;
 }
 
 h2
@@ skipping 98 matching lines @@
 }
 
 input:checked + .toggle-image
 {
   background-image: url(mobile/toggle.svg#on);
 }
 
 button
 {
   width: 100%;
-  height: 46px; /* equal to height of list item */
   border: none;
   font-weight: 600;
   text-transform: uppercase;
   color: #099DD1;
   background: none;
 }
 
 button.primary,
 button.secondary
 {
@@ skipping 20 matching lines @@
 {
   width: 36px;
   height: 36px;
   padding: 0;
   background-color: #099DD1;
   mask: url(mobile/trash.svg) center/19px no-repeat;
 }
 
 ul + button
 {
+  flex-shrink: 0;
   width: 100%;
-  padding: 0 20px; /* based on margin and padding of list item */
+  min-height: 46px; /* equal to min-height of list item */
+  padding: 15px 20px; /* based on margin and padding of list item */
   border: 1px solid #BBBBBB;
   text-align: start;
 }
 
 /* Dialogs */
 
 #dialog
 {
   display: flex;
   align-items: flex-start;
@@ skipping 111 matching lines @@
 {
   background-color: #BBBBBB;
   mask: url(mobile/checkmark.svg) center/cover no-repeat;
 }
 
 #dialog-recommended > button
 {
   border-width: 1px 0 0 0;
   text-align: center;
 }