I had a similar problem to this and traced it down to the HPLIP stuff.  I fixed 
it by
- opening the HPLIP toolbox
- choosing my printer
- going to print settings
- changing orientation to portrait

For some reason HPLIP had chosen reverse landscape for my newly
installed printer.   My guess is that firefox and others do not send a
"use portrait for this page" control signal if they believe that the
default mode is portrait.  Note that this HPLIP setting is independent
of the CUPS setting.  I'm not sure how to two settings work with each
other.

-- 
some apps print in landscape,and badly
https://bugs.launchpad.net/bugs/112391
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