Based on preference change logs (since 2013-07-13) users across all wikis overwhelmingly change thumbnail size to be 250-300px (see attached database output graph)
we should update the default to be 300px
This shouldn't affect users who have purposefully changed the value, only readers, and users who have not changed the default
Version: 1.24rc
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=67695
https://bugzilla.wikimedia.org/show_bug.cgi?id=67709
https://bugzilla.wikimedia.org/show_bug.cgi?id=49357
https://bugzilla.wikimedia.org/show_bug.cgi?id=69973