Question

This is my manifest:

{
  "name": "rabbi",
  "version": "1.0",
  "description": "something",
  "browser_action": {
    "default_icon": "icon.png",
    "popup": "popup.html"
  },
   "content_scripts": [ {
      "js": ["jquery-1.7.1.min.js", "rabbi.js"],
      "matches": [ "http://*.facebook.com/*", "http://facebook.com/*", "https://*.facebook.com/*", "https://facebook.com/*" ],
      "run_at": "document_end"
   } ],
     "permissions": [ "contextMenus", "tabs", "http://*.facebook.com/*", "http://facebook.com/*", "https://*.facebook.com/*", "https://facebook.com/*" ]
}

and rabbi.js:

<script type="text/javascript">
 $(document).ready(function(){

     alert("Thanks for visiting!");

 });

</script>

But a message “Thanks for visiting” never pops up when I enter facebook.

Answer 1

You are injecting a script, not a html document. So you don’t need the <script type="text/javascript"></script> tag.

as a side note: With the property "run_at": "document_end" your script is injected when the DOM is completely constructed. Which is in fact at the same time $(document).ready fires. This means you don’t necessarily need to wrap your code inside this function.