Comment 14 for bug 1334363

There's a hint that somebody has seen something similar with Apple Pages 5, where they get superscript eight '⁸' (U+2078) aswell. Superscript eight has the Unicode codepoint one lower, and so probably the opening ‘single smart quote’):

  https://discussions.apple.com/message/25685825

Another message that shows this in action (with Ubuntu Regular in Pages 5.2):

  https://discussions.apple.com/thread/6093729

I also found a reference to MS Outlook on Mac OSX replacing single and double quotes with superscript 1,2,3, but I think that's something different purely down to email and eight-bit encodings! As the same can occur with Thunderbird too:

  http://cabbagesofdoom.blogspot.co.uk/2014/01/how-to-stop-outlook-on-mac-osx.html
  http://forums.mozillazine.org/viewtopic.php?f=28&t=333695

Jay: out of interest, what Locale (language) are you using?