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great! any known addons it breaks ?

这个评论是针对附加组件的一个早期版本的(0.1.0)。 

It will only break some of the add-ons that load their own files into Web pages. It should be compatible with uBlock Origin and HTTPS Everywhere for example.
https://discourse.mozilla-community.org/t/support-no-resource-uri-leak/9004