Inject one line of JavaScript from firefox addon -

i new ff extension creation, , rather specific.

when run js command in, example, firefox's built-in sandbox, works fine, make ff addon on click same js command execute. command works in web page:

javascript:$('.plus').click();

i suppose doesn't have work this:

var widget = require("widget").widget; var tabs = require('tabs');  exports.main = function() {  new widget({     id: "user-widget-1",     label: "my mozilla widget",     contenturl: "http://www.mozilla.org/favicon.ico",     onclick: function(event) {                 javascript:$('.plus').click();     } }); 

};

thanks.

$(.plus) jquery syntax want load jquery content script widget. , want run code content script well, e.g.:

var data = require("sdk/self").data;  new widget({     id: "user-widget-1",     label: "my mozilla widget",     contenturl: "http://example.com/foo.html",     contentscriptfile: [data.url("jquery.js"), data.url("myscript.js")] }); 

and data/myscript.js like:

$(document).ready(function() {   $('.plus').click() }); 

if don't want click happen when document loads rather on specific event happening in extension, might want communicating content scripts. recommend reading general overview of content scripts.