I got a report that HP Smart Web Printing breaks Adblock Plus extension in Firefox. I checked the extension, the file toolbar.js in chrome/smartwebprinting.jar seems to cause the issue:
// Code at global scope
addEventListener("load", hpInitToolbar, false);
var printcmd = document.getElementById("cmd_print");
if(printcmd)
{
printcmd.setAttribute("oncommand","NormalPrint();");
}
var printpreviewcmd = document.getElementById("cmd_printPreview");
if(printpreviewcmd)
{
printpreviewcmd.setAttribute("oncommand","NormalPreview();");
}
This registers a listener for the "load" event - but some actions are carried out immediately, without waiting for the event to happen. Accessing browser's document before it is loaded breaks Adblock Plus and probably causes the issues reported in http://h30434.www3.hp.com/t5/Mobile-and-Web-printing/HP-SWP-and-Firefox-3-5-6-don-t-agree/td-p/19346... as well. Moving the code after addEventListener() call into hpInitToolbar function should fix the issue.
Unfortunately, I don't see any way to report this bug other than creating a topic here.
