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About this Add-on
As of yesterday (11 March, 2016) Alexa's API no longer return rank information.
Instead it returns 404 and a link to this page:
Which basically means that they no longer provide a free access to Rank info.
If you know other ways to retrieve Alexa rank, please let me know and I'll integrate it into extension.
UPDATE 2 (18 March, 2016):
It's working again.
I have been using WebRank toolbar for a long time. And absolutely loved it. Until the day I realized that it occupies a lot of view space in window. After I tried a lot of other ranking add-ons and none of them actually worked, I decided to make my own one that shows only Google and Alexa stats.
Github project page: