Sometime in the last six hours, my timeline stopped displaying, and started showing just a link, instead. This is the error I get from Firefox’s console, which appears to indicate a problem in the JS. Unfortunately, I don’t read JS well enough to unbreak the thing, myself. I’m taking suggestions…
Component returned failure code: 0x805e0006 [nsIDOMHTMLFormElement.submit] @ https://platform.twitter.com/widgets.js:29
Which version of Firefox are you using?