add "show sessions" to the history query options, so that we can disable it. by default, disable sessions for the history-on-places sidebar (as we are initially going for Firefox 2.0 parity on top of places.) To enable sessions, toggle the hidden "browser.history.showSessions" boolean pref. Thanks to Dan Mills <thunder@mozilla.com> for the fix. r=sspitzer,gavin git-svn-id: svn://10.0.0.236/trunk@216769 18797224-902f-48f8-a5cc-f745e15eee43
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