content wikihowtoolbar 		chrome/content/

skin 		wikihowtoolbar classic/1.0 chrome/skin/

locale 	wikihowtoolbar en-US 	chrome/locale/en-US/
locale 	wikihowtoolbar nl-NL 	chrome/locale/nl-NL/

overlay chrome://browser/content/browser.xul chrome://wikihowtoolbar/content/wikihowtoolbar.xul
overlay chrome://browser/content/browser.xul chrome://wikihowtoolbar/content/wp/script-compiler-overlay.xul