tab_worker.js

var pageModParams = {
  'include': ["*"],
	'attachTo': ["top", "existing", "frame"],
	'contentScriptFile': [ 
		data.url("src/common.js"),
		data.url("src/end.js")
		//other scripts to include
	]
};
function attachWorkerToTab(tab){
	var worker;
	if (!tab) tab = tabs.activeTab
	if (workersForTab(tab).length > 0) return;

	worker = tab['attach'](pageModParams);
	//configure worker listener stuff
}

tabs.on('activate', function(tab) {
		if (DEBUG_FIREFOX) console.log("[FIREFOX] activating tab " + tab.url);
		attachWorkerToTab(tab);
	});
tabs.on('ready', function(tab) {
	if (DEBUG_FIREFOX) console.log("[FIREFOX] tab ready " + tab.url);
	attachWorkerToTab(tab);
});