Canadian Shield is intended for home/personal use only and as a result may not work when users are logging in from an office and certain other remote environments.
The browser extension uses DNS over HTTPS (DoH) to validate the safety and security of a website. This means that users may run into issues using the extension in an environment that blocks DoH requests. In Firefox, for example, the browser extension makes a request to Canadian Shield to verify if the page should be blocked. Once it verifies the website is okay, it allows the request to continue. If an office is blocking DoH the browser extension may prevent a user from using their browser. We recommend that if you see this behaviour that you disable the extension on your work network, and then re-enable it when you are back at home.
With other browsers in this environment, such as Google Chrome, the extension may allow users to continue to visit websites but will not offer Shield’s protection capabilities. Web pages will resolve and display just fine. However, this does mean that if the DoH request is blocked in an office environment, it will never decide that anything is blocked.
CIRA is working on an update to the extension that will let users know when the extension is not functioning normally.