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When I view the browser console, I see the following error:

Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”).

It seems related to this function in content-script.js:40:65:

function executeScript(script) {
    var element = document.createElement('script');
    element.innerHTML = '('+ script +')();';
    (document.body || document.head || document.documentElement).appendChild(element);
    // We need to remove the script tag after inserting or else websites relying on the order of items in
    // document.getElementsByTagName("script") will break (looking at you, Google Hangouts)
    element.parentNode.removeChild(element);
}