i use the default Evince "Document Viewer 2.26.2" in Gnome in fedora and firefox and seamonkey auto open pdf's in it
or the KDE "Okular"
i gave up on adobe a while ago it is very bloated
but i do not use Chromium ( except for the game called that)
Running Arch ,OpenSUSE 11.4-64bit & Scientific Linux 6.1-64bit ( fedora 4 to 11)
My Celestia Downloads