This is probably due to the recent clamp down on local security in Firefox (Chrome has never worked).
You might need to install + run NodeJS to get these running properly (see: Choice Script Changes To Run Tests With Firefox ver 68 ( See Post 12 & 31)), or use CSIDE.
In the meantime if you open your browser’s console (usually F12), and post any errors you have there, that will help to confirm.
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