Update Travis to 59.0b11 unbranded build

.travis.yml

@@ -10,7 +10,7 @@ env:
     global:
         secure: "NxvkbZ7/Op7BTGQRR3C4q8lLoO29f8WtyNN27NSH7AO3H0vBr1Vp5xO8gn+H2qHEug5HvM+YrZ/xAkNXaZVbOInmBmKVMxqVvdpKp9JM1Amf+gzsXWQphfySvs6iqzyP6cwU/jspdvX/WSakgU5v7PWXxtUIaKxdANt6Rw7W+Pc="
     matrix:
-        - FX_VERSION="52.0.3"
+        - FX_VERSION="59.0b11"
 matrix:
     fast_finish: true
     #allow_failures:
@@ -22,8 +22,8 @@ addons:
     packages:
     - dbus-x11
 install:
-    - if [ $FX_VERSION = "52.0.3" ]; then
-        wget -O tarball "https://archive.mozilla.org/pub/firefox/tinderbox-builds/mozilla-release-linux64-add-on-devel/1491732920/firefox-52.0.3.en-US.linux-x86_64-add-on-devel.tar.bz2";
+    - if [ $FX_VERSION = "59.0b11" ]; then
+        wget -O tarball "https://queue.taskcluster.net/v1/task/L9FO6qp_TnaLkGB_fFy0Sw/runs/0/artifacts/public/build/target.tar.bz2";
       fi
     - tar xf tarball
 before_script: