On 9/15/17 10:08 AM, Christoph Kerschbaumer wrote:
> To mitigate that risk we installed a pref 
> (“security.data_uri.block_toplevel_data_uri_navigations”) which blocks all 
> top-level navigations to a data: URI. We plan to flip that pref in Nightly 
> using “ifdef EARLY_BETA_OR_EARLIER”. In a few weeks we will evaluate whether 
> we can flip on that change in behavior for FF57 or whether we are going to 
> wait to ship that change in behavior till FF58.

This seems like it might be a good candidate for running a Shield
preference-flip study: https://wiki.mozilla.org/Firefox/SHIELD

- Mike Kelly
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