Overloaded URL tags in the form [URL media=...] are now processed as and counted as [MEDIA] tags and should be subject to the same restrictions. Thanks to Xon for the helpful report.
JavaScript event listeners used for lazy loading are now passive and apply during the capture phase. This isn't expected to make a practical difference but it may help with inconsiderate third-party scripts that hijack events.
Note that support for XenForo 2.0 and 2.1 has become harder for me to guarantee and will be phased out in future releases. If you haven't upgraded to XenForo 2.2 yet, let me know.