Describe the bug
angular-recorder throws an error when browser plugin is used.

To Reproduce
Steps to reproduce the behavior:

1. Use Firefox with Change Geolocation add-on
2. Open oppia.org
3. The page won't load and there is an error in the console.

Desktop (please complete the following information; delete this section if the issue does not arise on desktop):

• OS: Ubuntu
• Browser: Firefox with Change Geolocation add-on

Additional context
This is caused by this part of angular-recorder code. It tries to retrieve the src attribute of the last script-import and since the plugin inserts <script>…</script> without the src attribute it throws an error.