Hi there! I'm sorry to hear that you're experiencing trouble opening Twitter in Firefox. It seems like you're facing some login and error issues, and I'd be happy to help you with that. First, let's try clearing your browser cache and cookies, which might resolve the login problem. You can do this by clicking on the three horizontal lines in the top right corner, then choosing "Options," "Privacy & Security," and under "Cookies and Site Data," click on "Clear Data." After doing that, restart Firefox and try logging in again. If the issue persists, try disabling any browser extensions you might have installed, as they could be causing conflicts. Let me know how it goes, and I'll be here to assist you further if needed. Happy browsing!