Old Twitter

1. Install user agent switcher for Chrome - https://chrome.google.com/webstore/detail/user-agent-switcher-for-c/djflhoibgkdhkhhcedjiklpkjnoahfmg
2. Download this list by opening the link and pressing ctrl + s https://techpatterns.com/downloads/firefox/useragentswitcher.xml
3. Open the User-Agent Switcher settings and click import settings, then import the useragentswitcher.xml file from 2.
4. Click on Permanant Spoof list on the left, type "twitter.com" in the domain box (without quotation marks) and for User-Agent String, select MSIE 11.0 - (Win 7 64), then click add
5. Log out of twitter and/or clear cookies, then log back in and it should be back on the old design.