Last modified: 2014-02-12 23:54:50 UTC
This bug is documented in the Firefox Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=765537 It was confirmed to be a Wikipedia error, not a Firefox error. The suggested fix is also in that thread, see this comment: https://bugzilla.mozilla.org/show_bug.cgi?id=765537#c2 The gist of the bug is that on the mobile Wikipedia site (I apologise if this is the wrong place to file against that), under Firefox 13 (which is Firefox Beta in the android market, and the most current version of the desktop browser), a failure in the Javascript causes the first section heading on some pages to not be expandable.
*** This bug has been marked as a duplicate of bug 37660 ***