Can I kill option 1 right away? Capturing file:// in the browser won't
even work as a band-aid in the short term. All it would take to get
around that would be for me to open a page that contains some links to
file: URLs and navigate to them. Yes, we have an API to intercept
navigations in the main frame, but then I could get around that by
making sure they navigate a subframe. Even if we had an API to intercept
subframe navigations (and we definitely shouldn't), a webpage can still
embed media or image elements pointing to file: URLs (of course, same
origin restrictions prevent a remote attacker from being able to access
the contents them, but a page can still display them to the user).

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https://bugs.launchpad.net/bugs/1393515

Title:
  browser allows browsing the phone filesystem

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