- Button for checking custom default URL is not 404 (!) check on apply (?)
- Make it run in cache-less mode if cache dir cannot be created (??)
- Only cache "mystery man" once for all hashes (what if changes) (?)
-- Empty avatar/missing cache button(s) (?)
- Run network retrieval in a separate thread started at header capture
hook (??)
- Alternate proxy support (send avatar requests through a proxy which