Sqsuarespace injects custom code blocks using innerHTML in JS - and also  serves pages as a SPA (SinglePageApplication). This is not a good combination - it prevents browsers from loading e.g. <script> tags. They should have used eval() instead - and it would most likely have been fixed once and for all.

The fix is relatively easy though.

Head over to https://your-site-here.squarespace.com/config/design/styles and turn OFF Ajax Loading in order to get the filemail scripts to work

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