This extension aims to reduce "engagement" on New Twitter by keeping you on the chronological timeline and moving retweets to a separate timeline, so your main feed contains only what the people you follow have to say. It also tones down some UI elements.
Control Panel for Twitter gives you some of the settings you wish Twitter Web had, and also adds some missing features.
Missing your third-party Twitter client on your iPhone? Control Panel for Twitter can give you back some control over your timeline.
Browser extension which makes it easer to follow comment threads on Hacker News across multiple visits, allows you to annotate and mute users, and other UI tweaks and mobile UX improvements