Bug#827195: evince plugin won't open postscript

[Jason Crain]

On Wed, Sep 14, 2016 at 12:17:47AM +0200, Leon Meier wrote:
> A file which cannot be opened is, e.g.,
> http://www.math.chalmers.se/~palbin/rickard.ps
> 
> The browser hangs for a few minutes, then the blank tab is displayed.
> 
> In fact, no postscript file can be opened from the browser.

Firefox apparently does not implement whatever GTK3 support the plugin
needs.  I might need to poke a couple upstream bug reports so that the
plugin at least shows an error message instead of freezing.

It does work reasonably well in epiphany browser.