I’m seeing these errors in Console, if this helps.
DevTools failed to load source map: Could not load content for chrome-extension://pgjjikdiikihdfpoppgaidccahalehjh/webspeed.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
DevTools failed to load source map: Could not load content for chrome-extension://hgmoccdbjhknikckedaaebbpdeebhiei/content.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
DevTools failed to load source map: Could not load content for https://www.chessmugs.co.uk/wp-content/plugins/3d-viewer/public/js/model-viewer.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
Looks like the latest version 1.2.2 has fixed the issue.