Firefox javascript API reference is available where? Function exists: BrowserCloseOtherTabs()

Firefox javascript API reference is available where?
Function exists? BrowserCloseOtherTabs()

I just cant seem to find it, or this function I want.
... In mozilla I used the mouseGestures extention to create a geture 
that opens a new tab, going to that tab, and closes all other tabs.
I like this.  It's a quick start over without closing/opening.
Something like this (as "Custom JavaScript Code in the mouse gesture)
   BrowserOpenTab();
   BrowserCloseOtherTabs();
   /* or maybe removeAllTabsBut(tabbrowser.mContextTab); */
   /* or maybe CloseAllOtherTabs(); */

But in Firefox BrowserCloseOtherTabs() does not exist.
Anybody know the function I'm looking for?
Or a reference where I could find it.
Or an example?
Or a search engine that could find it?
(yes, I'm a little frustrated)

Thanks in advance.