With respect to rendering pdf
.
Firefox 19 uses an add-on which in turn uses HTML5 to render pdf files,
and it does a beautiful job. IceWeasel 10 does not reject this add-on,
but seems not to be able to understand HTML5, and does a poor job with pdf
files as a result.
There may have been an Adobe Acrobat add-on at one time that would serve
IceWeasel, but currently a Documents-Online-Viewer add-on seems the only
thing available to IceWeasel 10, and it does not do a really good rendering
of pdf in some instances: such as a WireShark user manual.
Some good news on the IceWeasel front, perhaps.
.
I haven't tried it myself, but this may bring Firefox 19 pdf capability to IceWeasel.
http://www.xrousse.org/upgrade-firef...debian-wheezy/
Maybe too soon, Mint has a problem.