このアドオンについて
This is slightly modified to work with newer versions of firefox, since the original auto proxy is not compatible any more.
Since Firefox 57, only webextension add-ons can be supported. That requires almost rewriting a new add-on, which I can not handle. So this add-on will not be updated, my advice is switching to Switchy Omega when it's ready. Here's the link, it's currently beta version, you can help test it if you want.
https://addons.mozilla.org/en-US/firefox/addon/switchyomega/
Since Firefox 57, only webextension add-ons can be supported. That requires almost rewriting a new add-on, which I can not handle. So this add-on will not be updated, my advice is switching to Switchy Omega when it's ready. Here's the link, it's currently beta version, you can help test it if you want.
https://addons.mozilla.org/en-US/firefox/addon/switchyomega/