Adding DOM Mutation listeners to different DOMs correspoding to each open tab in Firefox.

Hello:

I have written DOM Mutation event handlers for the loaded DOM in a
particular tab as follows:

content.document.addEventListener("DOMNodeInserted", domNodeInserted,
false);

I called this line, everytime a new Tab was opened for its particular DOM,
but all of this have the same event handler function. 

The problem is, when I try to call the removeEventListener for this event, I
don't know which event listener gets removed, as there is one corresponding
to each DOM... So even after calling the removeEventListener, my mutation
handler gets fired!

I tried calling the content.document.removeEventListener for the active tab,
but doesn't help... 

Any hints as to whats goin wrong here?

Thanks...
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