Hi Alex,
Thanks for the quick response. I submitted helpdesk ticket with screenshots, including errors in js console. In summary, the only errors I see in JS console (after clearing, then refreshing the page) are:
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TypeError: wp is null heartbeat.min.js:1:3558
xhr https://mydomain.com/wp-includes/js/heartbeat.min.js?ver=5.0.3:1 i4Backbone
d https://mydomain.com/wp-includes/js/heartbeat.min.js?ver=5.0.3:1 dispatch2Backbone
——
Firefox can’t establish a connection to the server at wss://public-api.wordpress.com/pinghub/wpcom/me/newest-note-data. rest-proxy:6:4259
I don’t get any additional errors in console when clicking on the “filter by…” links.
Thanks for your help!