In the example below, I built a clickable markdown image with
[![enter image description here]], where
![enter image description here] is a markdown hyperlink to the original-sized image.
Testing with Firefox Mobile 31.0 on Android "KitKat" 4.4.2 (Samsung Galaxy S4) produced the results shown in the examples below.
Example 1: when you make an image clickable in an answer, the answer's mobile image sizing breaks (and text renders off the screen), as shown in this screen-capture from Firefox Mobile:
You can reproduce the problem by checking FF mobile rendering of the answer which inspired this bug report.
Example 2: the same Firefox Mobile rendering of an answer without a clickable image renders without problems in Firefox Mobile:
NOTE: This seems to be a bug in all Firefox versions... Chrome / Safari Mobile don't seem to suffer from the problem.