Hide tabs manual

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If you know any better way to hide the tabs, please let me know.

Adding this file to \chrome\userChrome.css hides top tabs.

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

#TabsToolbar, #PersonalToolbar {
    visibility: collapse;
}

#sidebar-header {
    visibility: collapse !important;
}