Mastodon now supports more types of URLs. Also, the list of allowed hosts can now be edited on the Mastodon media site page directly rather than in the add-on's options.
Other miscellaneous changes include:
Bits and options related to the now-defunct Amazon embeds have been removed. The temporary Amazon media site is still present and associate tags are still handled. There should be no functional change compared to previous version.
The requirements have been officially bumped to XenForo 2.2, as I don't think anybody is running XenForo 2.1 on PHP 8.0.
The Find in page feature now works with unquoted attributes.
Some unused code has been removed, some PHP declarations added. No functional change intended.