title: Image not displaying on Firefox (bootstrap + Wordpress) due to AdBlock issue
body: <p>I have this code using Wordpress + Bootstrap, and somehow images aren't showing in Firefox, however, they display correctly in any other browser. I did a search at SO and found some answers related to disabling ad-block, but it didn't solve the issue, so I'm quite lost here.</p>
  
  <p>The relevant HTML part</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="navbar-collapse collapse "&gt;
    &lt;ul class="nav navbar-nav"&gt;
      &lt;li id="menu-item-12" class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-4 current_page_item menu-item-12 active"&gt;&lt;a title="Home" href="/"&gt;Home&lt;/a&gt;
      &lt;/li&gt;
      &lt;li id="menu-item-87" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-87"&gt;&lt;a title="Carriers" href="/our-carriers/"&gt;Carriers&lt;/a&gt;
      &lt;/li&gt;
      &lt;li id="menu-item-86" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-86"&gt;&lt;a title="Our Story" href="/our-story/"&gt;Our Story&lt;/a&gt;
      &lt;/li&gt;
      &lt;li id="menu-item-121" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-121"&gt;&lt;a title="Employees" href="/employees/"&gt;Employees&lt;/a&gt;
      &lt;/li&gt;
      &lt;li id="menu-item-14" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-14"&gt;&lt;a title="Contact Us" href="/contact-us/"&gt;Contact Us&lt;/a&gt;
      &lt;/li&gt;
      &lt;li class="menu-item"&gt;
        &lt;div class="col-fb"&gt;
          &lt;a href="https://www.facebook.com/pages/xxxxx"&gt;
            &lt;img class="like_us" src="xxxxx/wp-content/themes/xxx_Theme/images/fb_like.png" alt="Like AIG on Facebook" /&gt;
          &lt;/a&gt;
        &lt;/div&gt;
      &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>and here's the CSS. I've added the last 2 lines in an attempt to "force" display, but nothing happened, exception made that the elements now have width and height, which they didn't have before I have added those lines:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.navbar-brand {
    line-height: 1px !important;
    margin: 0 !important;
    padding: 3px 15px
  }
  #nav,
  .navbar {
    border: 0;
    position: relative;
    height: auto;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    font-size: 24px;
  }
  .nav-header ul {
    min-height: 300px;
    background: #3f4646;
    width: 50%;
    height: 100%;
    position: absolute;
    right: 0;
    top: 0;
  }
  .navbar-collapse.collapse {
    padding: 0 !important;
    background: #7f8c8d;
    z-index: 100000000 !important;
  }
  li.active a {
    background: transparent !important;
  }
  ul.navbar-nav {
    margin: 0 !important;
    position: relative;
    top: 0px
  }
  .navbar li {
    padding: 0 10px;
    border-right: 1px solid rgba(255, 255, 255, 0.5)
  }
  .navbar li a {
    color: #fff !important;
  }
  .navbar li a:hover {
    color: #2c3e50 !important
  }
  .navbar .container {
    max-height: 40px;
    margin: 0 auto !important;
    top: 0px !important;
    position: relative;
    z-index: 100000000 !important;
    border: none
  }
  .nav-header ul {
    padding: 10px;
  }
  .nav-header ul li {
    display: block;
    padding: 2px 10px !important;
    margin: 0 !important;
    font-size: 10px
  }
  .col-fb a,
  .col-fb {
    display: block;
    max-width: 100%;
    max-height: 100%;
    min-width: 150px;
    min-height: 50px;
    padding: 5px;
    position: relative;
    z-index: 100000
  }
  .col-fb img {
    display: block;
    width: 140px;
    max-height: 100%;
    min-height: 30px;
    position: relative;
    z-index: 1000100;
    height: auto;
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>As additional info, while you may see the image has a <code>fb_like</code> class, when I check Firefox inspector it has a random class added: <code>cprflzcqqyowaemjgtdl</code></p>
  
  <p>Any idea on what am I doing wrong or how to fix this?</p>
  
  <p><strong>EDIT: It actually is an AdBlock issue, so I'd need to know how to override that issue, since I can disable it, but of course I need to allow this for everybody</strong></p>