content treestyletab jar:chrome/treestyletab.jar!/content/treestyletab/ overlay chrome://browser/content/browser.xul chrome://treestyletab/content/treestyletab.xul locale treestyletab en-US jar:chrome/treestyletab.jar!/locale/en-US/treestyletab/ locale treestyletab ja jar:chrome/treestyletab.jar!/locale/ja/treestyletab/ skin treestyletab classic/1.0 jar:chrome/treestyletab.jar!/skin/classic/treestyletab/