Better warning message.
Improve the open anyway link
Improve warnings.
Separate explanation of why we think it's corrupt, make it clear that no matter how trivial it is it won't make the page safe.
Better intro message for content filter errors. We have been able to actually fetch the file; we just can't guarantee its safety.
Make the meta/head message a bit clearer.
Fix adding FetchException.unsafeContentDetails to other exceptions and move recreation of the FetchException into UnsafeContentTypeException.
Slightly more idiot-proof.
Merge branch 'clearer-messages-on-filter-failure' into next