Re: Browser crash using <nsCOMPtr> inside plugins !

>   if (scriptablePeer)
>    {
>   // ... told them the browser
>   *(nsISupports **)value = scriptablePeer;

here, you probably want scriptablePeer.get();
also, when assigning to a raw pointer, you're not going to get automatic 
addref'ing - so you have to say

// still need to ADDREF because "value" is not a nsCOMPtr
*(nsISupports**)value = scriptablePeer.get();
NS_ADDREF(*(nsISupports**)value);

my suggestion would be at least to use an intermediary pointer to make 
this readable:

// assign-and-addref is a common pattern
nsISupports* result = scriptablePeer.get();
NS_ADDREF(result);

// now do the funky casting
*(nsISupports**)value = result;

Alec