For parity with Desktop, we shouldn't display Insecure Page for files. Desktop uses something like "This page is stored on your device" for files, which we should be able to detect too. http://mxr.mozilla.org/mozilla-central/source/browser/base/content/browser.js#7027 and http://mxr.mozilla.org/mozilla-central/source/browser/components/controlcenter/content/panel.inc.xul#33

Note that bug 1099088 is for implementing "This is a secure Firefox page" for about: pages, so the implementation should be related.

Mentor bug?

Hi, if this bug is still open, can it be assigned to me?

Re-triaging per https://bugzilla.mozilla.org/show_bug.cgi?id=1473195 Needinfo :susheel if you think this bug should be re-triaged.

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