why the tabs in firefox give the same window id using xwininfo

[sri]

hi..friends
i used xwininfo to get the windows id..
when i used xwininfo on mozilla firefox browser with more than one tab
opened
it is giving the same window id for any tab with in that window.
why it is giving the same window id for all the opened tabs with in that
window
is it possible to know why it is..


-- 
Thanks & Regards
sridhar gupta yerram
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