DEV: Enable "xmpp session" on TT

I've created a demo that appends dynamic XHTML element, onto the current loaded page, following the SPS hierarchy. I've tested it on google.com, so here's how the hierarchy looks like:
#document
---HTML
---HEAD
---BODY
---DIV id=xmpp-incoming
---DIV id=xmpp-outgoing
---script
Upon testing, I connect to another user through SPS. I send a message using the dinamically added chatbox and append the message to xmpp-outgoing. The message is appended successfully, but there is no message being sent to the other user. Then I activate the "xmpp session" by:
- clicking the user's name in my roster.
- Connect > Current Page
After that, I tried sending message again using the chatbox, and the message was sent successfully to the other user. The other user viewed the message in their SPS sidebar.


Theory:
by doing Connect > Current Page (C>CP), I initiated an xmpp session between me and the other user. According to SPS codes, C>CP invokes a function called XMPP.enableContentDocument(...). This function takes the following argument:
panel - a XUL content panel element (browser or iframe)
account - the account you're connecting from
address - the address of the contact you'll interact with inside the panel
type - 'chat' or 'groupchat' - if a message leaves the page without
type, it will get the type specified by this argument
createSocket - boolean - create the two div's in the page if they're
not already there
Thanks to Bard for his explanation of the parameters in this thread.

I will try to use this function in my codes, to enable xmpp session by itself.

Effort:
- add XMPP.enableContentDocument(...) to current codes.
- statically set XMPP.enableContentDocument(...) params to:
- panel = (still unknown, due to Firefox security restriction)
- account = user1@gmail.com
- address = user2@gmail.com
- type = 'chat'
- createSocket = false
- got these error message:
XMPP not define;
Solution: added script src "chrome://xmpp4moz/content/xmpp.js"
- then got this error:
Error: uncaught exception: Permission denied to get property UnnamedClass.classes
- and message is still not send.
- theory: maybe the value for panel is not correct. Tried all of these:
- doc
- root
- bodyRoot
- windowRoot
- browser