removeTab - Archive of obsolete content
if browser.tabs.autohide is true, the row of tabs will collapse if only one tab remains.

tabbrowser - Archive of obsolete content
if browser.tabs.autohide is true, the row of tabs will collapse if only one tab remains.

TPS Pref Lists
for example: var prefs1 = [ { name: "browser.startup.homepage", value: "http://www.getfirefox.com" }, { name: "browser.urlbar.maxrichresults", value: 20 }, { name: "browser.tabs.autohide", value: true } ]; pref lists and phase actions the only actions supported for preference asset lists are modify and verify: prefs.modify prefs.verify sync only syncs certain preferences.