Update testing on newer Firefox (security.fileuri.strict_origin_policy)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
diff --git a/Readme b/Readme
index 886c034..817b20d 100644
--- a/Readme
+++ b/Readme
@@ -37,9 +37,9 @@
   ./yaml-to-kml.py -f users/[username].yaml -o www/developers.kml
   firefox www/index.html
 
-You might need to temporarily change the privacy.file_unique_origin in
-about:config to allow accessing local resources in page directory.  Disable the
-setting after tests.
+You might need to temporarily change the security.fileuri.strict_origin_policy
+(or privacy.file_unique_origin in older versions) in about:config to allow
+accessing local resources in page directory.  Disable the setting after tests.
 
 If all looks good, you need to push this information back into the kernel.org
 repository.  Once we have collected enough initial data, we will integrate the