We intent to block web pages from loading filesystem: URLs in the top frame. filesystem: URLs are only supported by Chrome. They contain an inner URL which consists of the origin that created the filesystem URL. For example, a filesystem URL created by http://example.com looks like filesystem:http://www.example.com/temporary/file0. The appearance in the omnibox is confusing for users, and there is currently an undisclosed security bug for this. This change does NOT affect file:// URLs.
Docs: https://bugs.chromium.org/p/chromium/issues/detail?id=811558