>That sounds strange. I'd like to think large sites like Twitter would take great care to adhere to Web standards, and work properly with major browsers.
>
>Have you tested using multiple computers? Maybe you know other Twitter users, you could ask them if they see the same problem (no, I don't use Twitter).
>
>You could also try a clean uninstall, then reinstallation of FireFox: http://support.mozilla.org/en-US/kb/Uninstalling%20Firefox
>
>Do you run your computers/browsers in the US-EN locale, or are you using something else?

I run with the default. Yes, that is US-EN locale.

I am pretty sure if I would reinstall both browsers, the problem would have went away. I suspect a bug in each browser. However, I would have waited for a new version to be released before doing so.

When I tried to run it from others PCs, all of them were giving javascript errors on Twitter site. For that part, I would say it's on their end. Because, I tested from various points of location. From the East, and from two Terminal Server connections from two networks 1000 km away.