Tweak the about box layout a bit.

- Put the Licensing link in the center
- Strengthen the "fog" background for the credits text for readability
- Add CSS animation to fade it in.

application/palemoon/base/content/aboutDialog.xul

@@ -75,8 +75,8 @@
     </vbox>
     <vbox id="aboutLinkBox">
       <hbox pack="center">
-        <label class="text-link bottom-link" href="about:license">Licensing information</label>
         <label class="text-link bottom-link" href="about:rights">End-user rights</label>
+        <label class="text-link bottom-link" href="about:license">Licensing information</label>
         <label class="text-link bottom-link" id="releaseNotesURL">Release notes</label>
       </hbox>
       <description id="aboutPMtrademark">&trademarkInfo.part1;</description>

application/palemoon/branding/official/content/aboutDialog.css

@@ -22,17 +22,31 @@
 }
 
 #aboutTextBox {
+  animation: 3s fadeIn;
+  animation-fill-mode: forwards;
   font-family: Arial, helvetica;
   font-size: 14px;
   text-shadow: 1px 1px 0px #9ABCD5;
-  padding: 0px 10px;
+  padding: 15px 10px 5px;
   background: linear-gradient(to bottom,
                               transparent 0%,
-                              rgba(255, 255, 255, .3) 20%,
-                              rgba(255, 255, 255, .5) 75%,
+                              rgba(255, 255, 255, .6) 15%,
+                              rgba(255, 255, 255, .7) 85%,
                               transparent 100%);
 }
 
+@keyframes fadeIn {
+  0% {
+    opacity: 0;
+  }
+  50% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+
 #aboutLinkBox {
   padding: 15px 10px 0;
   font-family: Arial, helvetica;

application/palemoon/branding/unstable/content/aboutDialog.css

@@ -22,17 +22,31 @@
 }
 
 #aboutTextBox {
+  animation: 3s fadeIn;
+  animation-fill-mode: forwards;
   font-family: Arial, helvetica;
   font-size: 14px;
   text-shadow: 1px 1px 0px #D5BC9A;
-  padding: 0px 10px;
+  padding: 15px 10px 5px;
   background: linear-gradient(to bottom,
                               transparent 0%,
-                              rgba(255, 255, 255, .3) 20%,
-                              rgba(255, 255, 255, .5) 75%,
+                              rgba(255, 255, 255, .6) 15%,
+                              rgba(255, 255, 255, .7) 85%,
                               transparent 100%);
 }
 
+@keyframes fadeIn {
+  0% {
+    opacity: 0;
+  }
+  50% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+
 #aboutLinkBox {
   padding: 15px 10px 0;
   font-family: Arial, helvetica;