[jQuery] Using JQuery in firefox extension

error about content.$ is not a function or window.content.eval('$("img").click(function() { alert("hello")});); // could not use eval what should i do to make JQuery work in firefox extension? thanks lucemia

[jQuery] Using JQuery in firefox extension

or about content.$ is not a function or window.content.eval('$("img").click(function() { alert("hello")});); // could not use eval How should i do to use JQuery in firefox extension? thanks lucemia