About protocol links - MozillaZine Knowledge Base

There are a few special URLs, which begin with about:, that you can type into the Location Bar. (In Thunderbird, which has no Location Bar, or in SeaMonkey, you can also use them as "Mail Start Page".) Listed about: URLs about: URLs that are listed in about:about page. about: — The same page as "Help -> About" (except that, on some applications, Help → About is a much smaller popup). about:about —

[reki144]

　しらなかったあああああ！！！

[rraymondhp]

mozilla about 隠し機能　プログラマー