So, I was going down a research rabbit hole on my phone (Firefox for Android 133.0.3), and wanted to transfer the tabs to my PC. Apparently, sending 259 tabs is not really an intended use case, as only 99 of those tabs transferred (tab sending wasn't batched either), and now I can't send any tabs from or to my phone. I just get the error "unable to send" on my phone, and tabs sent on any PC don't arrive either. I tried signing in and out on those devices, but nothing works.