diff --git a/apps/firefox/templates/firefox/firstrun/a.html b/apps/firefox/templates/firefox/firstrun/a.html
index bad8c3792b3..ed81bae0972 100644
--- a/apps/firefox/templates/firefox/firstrun/a.html
+++ b/apps/firefox/templates/firefox/firstrun/a.html
@@ -122,7 +122,7 @@ <h1>
     </div>
 
     <div class="screenshot{% if copy == 'a' %} screenshot-offset{% endif %}" id="pinnedtabs-screenshot">
-      {{ platform_img('img/firefox/firstrun/pinnedtabs.png', alt=_('Pinned tabs')) }}
+      {{ platform_img('img/firefox/firstrun/pinnedtabs.jpg', alt=_('Pinned tabs')) }}
     </div>
   </article>
 
@@ -163,7 +163,7 @@ <h1>
     </div>
 
     <div class="screenshot">
-      <img src="{{ media('img/firefox/firstrun/brand.png') }}">
+      <img src="{{ media('img/firefox/firstrun/brand.jpg') }}">
     </div>
   </article>
 {% endif %}
@@ -204,7 +204,7 @@ <h1>
     </div>
 
     <div class="screenshot">
-      {{ platform_img('img/firefox/firstrun/themes.png', alt=_('Themes')) }}
+      {{ platform_img('img/firefox/firstrun/themes.jpg', alt=_('Themes')) }}
     </div>
   </article>
 {% endif %}
@@ -246,7 +246,7 @@ <h1>
     </div>
 
     <div class="screenshot">
-      {{ platform_img('img/firefox/firstrun/awesomebar.png', alt=_('Awesome Bar')) }}
+      {{ platform_img('img/firefox/firstrun/awesomebar.jpg', alt=_('Awesome Bar')) }}
     </div>
   </article>
 {% endif %}
@@ -288,7 +288,7 @@ <h1>
     </div>
 
     <div class="screenshot">
-      {{ platform_img('img/firefox/firstrun/bookmarks.png', alt=_('Bookmarks')) }}
+      {{ platform_img('img/firefox/firstrun/bookmarks.jpg', alt=_('Bookmarks')) }}
     </div>
   </article>
 {% endif %}
diff --git a/apps/firefox/templates/firefox/firstrun/b.html b/apps/firefox/templates/firefox/firstrun/b.html
index f1e38ab0377..bc23049cee7 100644
--- a/apps/firefox/templates/firefox/firstrun/b.html
+++ b/apps/firefox/templates/firefox/firstrun/b.html
@@ -78,7 +78,7 @@ <h1>
     </div>
 
     <div class="screenshot">
-      <img src="{{ media('img/firefox/firstrun/b/doing-good-collage.png') }}">
+      <img src="{{ media('img/firefox/firstrun/b/doing-good-collage.jpg') }}">
     </div>
   </article>
 
@@ -106,7 +106,7 @@ <h1>
       </div>
 
       <div class="screenshot">
-        {{ platform_img('img/firefox/firstrun/b/pinnedtabs.png', alt=_('Bookmarks')) }}
+        {{ platform_img('img/firefox/firstrun/b/pinnedtabs.jpg', alt=_('Bookmarks')) }}
       </div>
     </aside>
     <aside class="column themes">
@@ -137,7 +137,7 @@ <h1>
       </div>
 
       <div class="screenshot">
-        {{ platform_img('img/firefox/firstrun/b/themes.png', alt=('Themes')) }}
+        {{ platform_img('img/firefox/firstrun/b/themes.jpg', alt=('Themes')) }}
       </div>
     </aside>
   {% if version in '13' %}
@@ -156,7 +156,7 @@ <h1>{{ _('Find things fast') }}</h1>
       </div>
 
       <div class="screenshot">
-        {{ platform_img('img/firefox/firstrun/b/awesomebar.png', alt=('Awesome Bar')) }}
+        {{ platform_img('img/firefox/firstrun/b/awesomebar.jpg', alt=('Awesome Bar')) }}
       </div>  
     </aside>
   {% else %}
@@ -175,7 +175,7 @@ <h1>{{ _('Shortcuts') }}</h1>
       </div>
 
       <div class="screenshot">
-        {{ platform_img('img/firefox/firstrun/b/bookmarks.png', alt=('Bookmarks')) }}
+        {{ platform_img('img/firefox/firstrun/b/bookmarks.jpg', alt=('Bookmarks')) }}
       </div>  
     </aside>
   {% endif %}
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