Update: these embeds should be more reliable now. Let me know if they’re not.

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Since these embeds from Twitter and Instagram are unfortunately used by those companies for tracking purposes, Firefox has what it calls "Enhanced Tracking Protection", which blocks these embeds by default.

To disable this for a site, click the shield icon on your address bar and turn off "Enhanced Tracking Protection"

I'm going to build a custom solution to avoid this (and issues with embeds failing to load etc) at some point, since I'm not comfortable with embedding code from companies like Facebook here anyway

⚠️ Update:
Some browser extensions and other browsers including Brave mobile also block Twitter embeds

This also happens with certain extensions in other browsers.

and now brave for ios, probably android too.