The long em: id string is the application UUID of Firefox itself.
较长的em：id字符串是Firefox自身的应用程序全球惟一标识符(UUID)。
The wildcard asterisk character must be the last character in the App ID string.
星号必须是AppID字符串的最后一个字符。
The wildcard asterisk character must be the last character in the App ID string.
星号必须是AppID字符串的最后一个字符。
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