Facebook Callback appends '#_=_' to Return URL

As a spin-off from this recently fixed issue (https://www.drupal.org/node/2478609) i would like to open a Drupal thread to deal with an apparently still present side-effect FB connecting apps (like simple_fb_connect) are confronted with, once successfully logged in :
http://stackoverflow.com/questions/7131909/facebook-callback-appends-to-...
The added hashes are creating Jquery malfunctions in my current project, described in this comment :
https://www.drupal.org/node/2478609#comment-10615394

I've tried to implement 2 methods presented in this stackoverflow thread, by adding reached out javascript sample on $(window).load() event :

The events are picked up but somehow executed too late.
As adviced by the stackoverflow thread, i tried to find a solution adding the above piece of JS inside the HEAD tag, but couldn't find a suitable drupal function to add it there.
drupal_add_js() only reaches high enough until tab, but not .
In drupal 6 there's an equivalent function drupal_set_html_head() allowing to inject JS directly into the section.
Example :
http://drupal.stackexchange.com/questions/6592/how-to-add-script-to-head

How does D7 supports this, without considering the alternative of directly injecting the JS inside page.tpl.php, but from within a custom php hook module (preprocess_html or _page) ?

Thanks for contributing in this.