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As you know the 57 version of Firefox is coming quick. Thus just want to ask are you going to port it to webextension or at least if it is possible? Thanks.

Это отзыв для предыдущей версии этого дополнения (1.6.3). 

I intend to port it, but unfortunately the new webextension API doesn't provide the necessary functions yet. Chances are that the add-on will be broken for a while after the release of Firefox 57 until the API is implemented in Firefox.

You can follow the progress of the master password API:
https://bugzilla.mozilla.org/show_bug.cgi?id=1359182

Some further information is available here:
https://stackoverflow.com/questions/44068320