Allow redirecting url to local files

[N1N74]

Redirecting to local file url works on firefox with the following in user.js or about:config

user_pref("capability.policy.policynames", "localfilelinks");
user_pref("capability.policy.localfilelinks.sites", "http://localhost:8080");
user_pref("capability.policy.localfilelinks.checkloaduri.enabled", "allAccess");

There needs to be an option to enable linking to actual files, file:///file_url instead of http://localhost:8080/file_url.