Media display broken in Twitter(X) DMs in Private Browsing mode
I want to make the switch from Chrome to FF (to continue using UBO), and a problem I keep running into is media not displaying in Twitter(X)'s DMs while using Private Browsing mode. It only comes up as a gray block that says "Failed to Load" with "Retry" under it, but it never loads. It also asks that I re-enter my DM password every time the page reloads.
Everything works fine in a regular browser tab, the issues only occur in Private Browsing.
I have tried disabling UBO, disabling Enhanced Tracking Protection, and clicking the little shield icon in the URL and turning that off, too. Looking this up really didn't give me any results that actually helped, either.
Help would be much appreciated! This really is the last big hang-up I have to not switch.