A another user said & I agree with him,
It sounds like the rendering engine in this browser is not being seen by
screenreaders so that the reader can set up a virtual buffer to read the
content from. Using the mouse may well invoke a different way of getting the
content, but there is no control of how much is read, it just reads it all
like it would a message in a box etc.
Does this browser use an existing rendering engine like the one FF uses,
Chrome or the ie resident code?
