diff --git a/launch_dev_browser.sh b/launch_dev_browser.sh
index 8062afa856..b82a2e4ea9 100755
--- a/launch_dev_browser.sh
+++ b/launch_dev_browser.sh
@@ -11,10 +11,12 @@ declare -r chrome_dir="/tmp/chrome/${entropy}"
 
 launch_linux() {
   chromium \
+    --disable-site-isolation-trials \
     --disable-web-security \
     --ignore-certificate-errors \
+    --install-autogenerated-theme="100,150,255" \
+    --unsafely-treat-insecure-origin-as-secure="http://dev.fakeyou.com:7000" \
     --user-data-dir="${chrome_dir}" \
-    --install-autogenerated-theme="255,0,255" \
     http://dev.fakeyou.com:7000
 }
 
@@ -27,9 +29,9 @@ launch_mac() {
     --disable-site-isolation-trials \
     --disable-web-security \
     --ignore-certificate-errors \
+    --install-autogenerated-theme="100,150,255" \
     --unsafely-treat-insecure-origin-as-secure="http://dev.fakeyou.com:7001" \
     --user-data-dir="${chrome_dir}" \
-    --install-autogenerated-theme="255,0,255" \
     http://dev.fakeyou.com:7001
 }