Because the prior version is 0.1.1.1-signed.1-signed, there is no automated update to 0.1.1.

0.1.1 is mistreated as an inferior version.

Developers: you might rectify this by simply publishing a version 0.1.2 or greater.

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Is there supposed to be a GUI?

With Waterfox 56.2.2 there's a toolbar icon that does nothing when clicked.

With my 'everyday' profile for Firefox 61.0.1 there's no toolbar icon.

With a new profile for Firefox there's a toolbar icon that does nothing when clicked.

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I aimed to try the extension for Google Chrome with Firefox. http://www.youronlinechoices.com/uk/browser-extension refers to https://chrome.google.com/webstore/detail/youronlinechoices-persist/pbnjoahdkcfoagmplfghakflnofikibm – that's 404, not found in the Store.