Preventing videos being played
After going through my addons, HTTPS Everywhere appears to be the cause of videos not playing on sbs.com.au's cycling website.
Example of a video not working with HTTPS Everywhere enabled: http://www.sbs.com.au/cyclingcentral/video/302199875965/Tour-de-France-Highlights-Stage-7 (I am in Australia, I'm unsure if these videos are region blocked from elsewhere).
Disabling the addon makes the video play without issue. Adblock and Disconnect were disabled at the time of testing.
The version I'm using is 2014.6.26.