Add-ons s9e Media Sites 2.15.3

• Updated Tumblr to account for their new oEmbed response.
• The JavaScript lazy loader has been slightly reorganized with no functional change intended nor expected.

• Spotify has been updated to use their modern layout, a wide player with rounded corners.
• Amazon's fallback link has been updated to work more consistently when Adblock Plus is enabled.

• Mastodon is a federated social network, with instances hosted on many different domains, each with different rules and moderation. Currently only the main instance hosted at https://mastodon.social is supported.

Also, the CSS for Amazon fallback links has been slightly tweaked. There should be no visible change.