Today, Adobe Acrobat Reader asked again to install the security update. I let it, thinking it would fail in the same place. No! This time, no problems at all. Of course, it installed the AdobePDFViewer for all my browsers. Time to roll up my sleves and put a stop to this, once and for all:

sudo rm -rf /Library/Internet\ Plug-Ins/AdobePDFViewer.plugin

sudo touch /Library/Internet\ Plug-Ins/AdobePDFViewer.plugin

sudo chflags schg /Library/Internet\ Plug-Ins/AdobePDFViewer.plugin

As fair warning: that last line means it’s VERY hard to ever do anything to the file again. Even root can’t directly remove the file. However, this means Adobe’s shitty installer can’t remove it either.