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HN mods should probably update the submission URL to this one: http://blog.4chan.org/post/81896300203/webm-support-on-4chan

And you need to disable HTTPS Everywhere for blog.4chan.org since Tumblr doesn't support HTTPS :(

That link doesn't work either: Firefox can't establish a connection to the server at blog.4chan.org.

Edit: I just noticed moot's comment about disabling HTTPS Everywhere. The XML has an exclusion for "status" but not "blog". I'll send a pull request.

The link works for me on Firefox Nightly (yesterday's update).

Tumblr does support HTTPS, just not by default yet.