Firefox Addon SDK - how to make page in new tabs run only once - tabs

Question

I am new to Firefox Addon SDK, high level API.
What I wanted to do it, if a user click the icon on the toolbar, a new tab is opened, and run the script defined in contentscriptfile.
I use the script below:
var self = require("sdk/self");
var tabs = require("sdk/tabs");
var buttons = require('sdk/ui/button/action');
var button = buttons.ActionButton({
id: "mm-link",
label: "Visit mm",
icon: {
"32": "./icon-32.png",
"64": "./icon-64.png"
},
onClick: handleClick
});
function handleClick(state) {
tabs.open("about:blank");
tabs.on('ready', function (tab) {
tab.attach({
contentScriptFile: self.data.url("home.js"),
contentScriptOptions: {"aaa" : "1111", "bob" : "222"}
});
});
}
But it doesn't work as expected, and has the following problems:
The script runs repeatedly. (I wanted it run only once on each new tab)
Even if I click the "+" icon to create a new tab, the script will
run. (I wanted it only run when clicking the icon I created on the toolbar)
I have also tried to change 'ready' to 'activiate', the repeated running problem is gone, but every time I create the tab, the script will run.
Many thanks to any help.

Answer 1

The issue is that you're listening to the ready event of any and all tabs, rather than the one you just opened. One option is to do something like this:
function handleClick(state) {
tabs.open({
url: "about:blank",
onOpen: function onOpen(tab) {
tab.attach({
contentScriptFile: self.data.url("home.js"),
contentScriptOptions: {"aaa" : "1111", "bob" : "222"}
});
}
});
}
And attach the script using the onOpen handler. For more info the docs are here: https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/tabs#open%28options%29