HTML5 not running on Firefox [SOLVED]

My HTML5 builds wont run locally on Firefox (Windows 10). They run find on Edge or from an online source.

I’ve recently re-installed Windows 10 so might need to install something else? Any suggestions appreciated.

Here’s the output from Firefox:

HTML5 build shouldn’t work without HTTP server. It can be a local server, for example.
If you have python, the simplest way to make it is to run the following command in the folder with a game:
python 2:

python -m SimpleHTTPServer

python 3:

python3 -m http.server

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Firefox think that it unsecured.

You can disable this new restriction with privacy.file_unique_origin in about:config.

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