Add note about Firefox appcache bug.

diff --git a/support.html b/support.html
index ca787f61754ade7066ac66051881299880d18a5b..4fd01275068c922ae64f201236b2fbe55d49e1f6 100644 (file)
--- a/support.html
+++ b/support.html
@@ -119,6 +119,24 @@
         <code>http://localhost:8000</code> in your browser.
       </p>
 
+      <h3>"Firefox is currently in offline mode and can't browse the Web."</h3>
+      <p>
+        This is a <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1067593">bug
+        in Firefox when loading appcaches over HTTPS</a>. To work around it, you
+        can go to <strong>Preferences → Advanced → Network → Offline
+        Web Content and User Data</strong>, find "yukkurigames.com" in
+        the list, and remove it. Then it will work again, at least
+        until your next Firefox upgrade.
+      </p>
+      <p>
+        Appcaches are what lets you access parts of our site even when
+        you're offline; HTTPS is what makes sure when you are online
+        you're getting the updates to those apps from our site and not
+        someone trying to send you a virus. We could disable appcaches
+        but then no one would be able to use the site at all offline
+        (and this bug only affects Firefox).
+      </p>
+
       <h2 id=mobile>Mobile Browsers</h2>
       <p>
         If we labeled something "(Mobile) Browser" this means you can