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From http://forums.macrumors.com/threads/endless-progress-indicator-when-replying-to-a-topic.1990155/#post-23951233

Tested beyond XenForo at MacRumors Forums:

• the staleness of content from XenForo Community is evident with Firefox in safe mode.

Summary observations, from test results:

(For posterity, I have MAFF and PDF versions of that test page.)