firefox+acroread: 64bit caveats

At some point, I noticed that acroread plugin (for acrodead 8.1.2) works extremely slowly; moreover, keyboard input did not work at all (I could not scroll down using the keys or search in the document; given that I use this plugin quite a lot to read papers and preprints, that was a serious drawback). Since many plugins are not available in a 64bit version, I use the i386 version of firefox (removed x86_64 version altogether). The culprit turned out to be nspluginwrapper. I simply removed it, and now acroread plugin works just fine.