Improve avatar support, cache locally.

[kickscondor]

I just haven't put in the work to polish this up. Sometimes favicons aren't appearing. Sometimes they're just not loading.

[kickscondor]

So, here's what the rules should probably by closer to - and this coincides with what's needed for bundles.

• Start with the icon URL from Fraidyscrape (the feed icon usually).
• Check for its existence and that it's an image.
  • If so, cache it.
• Check for a "shortcut icon" or "og:image" or something like it on the home page (if one exists).
  • Works? Keep it.
• Lastly, check for a valid favicon.ico.
  • If found, cache that.
• Nvm. Generic globe or whatever.

[kickscondor]

Also 'Strict Tracking' is causing avatars on (say) pbs.twimg.com to get blocked - and I can't seem to whitelist them - so this is a more urgent item.

[kickscondor]

Yeah - and in my testing - the problem here is that the extension has whitelisted the domain, but https://fraidyc.at/s/ doesn't have access to it.

[Brin-o]

Not sure if things are still being worked on, but since a lot of pages (twitter, youtube) where you can track people simply use the site favicon, a simple fix would be to allow the person to pick an icon/emoji/pic to be used as the favicon.

More complex obviously, to grab the avatar of the profile.

[kickscondor]

@Brin-o I would like to do that eventually - is just a lower priority at the moment. Thank you!