Firefox 49.0.1, their reference (http://blog.163.com/jackylau_v/blog/static/175754040201191321337278/) to write a small helloworld. Xpi, but wrote this add-on cannot always prompt after installation, because it did not pass validation, have modified firefox configuration editor (the about: config page) will xpinstall. Signatures. Required to change the value of false,

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You can try the old domain name,