failing to load script in chrome

[cboleary]

On Chrome Version 87.0.4280.88 (Official Build) (64-bit)

regex extension is working great with nfl.com,
but when I try to use it with a local html report file I get this error

Content script was not loaded. Are you currently in the Chrome Web Store or in a chrome:// page? If you are, content scripts won't work here. If not, please wait for the page to finish loading or refresh the page.

if I load the same file to my webserver it works great as well
https://www.securedata.cadenhance.com/spreadsheet_html_report/html_spreadsheet_report_01.html

Can you download the file from the site above and try looking at a local copy?