For those viewing 360 degree images in Firefox, please be aware of problems with version 58 that have been fixed in version 59.
Since the last update of Firefox (version 58), webpages can’t display theta 360.
For example this one https://theta360.com/spheres/samples/fdac31cc-8935-11e7-bcdc-064087ff3472-1 keep loading even if it is at 100%.
Multiple users have confirmed that the problem has been fixed in Firefox 59. I personally have tested in on an iMac, Firefox 59, 64-bit. Fixed.
Originally posted in the RICOH THETA official forum: https://developers.theta360.com/en/forums/viewtopic.php?f=4&t=2509&p=5920#p5920