Tippin Extension (tippin.me)

Start sending and receiving tips on Twitter right away, using Bitcoin. That's it. You don't need anything else. This extension will show Tippin.me buttons for every Twitter user (Twitter.com and more are coming), and will allow you to send them a tip. - Send tips using Lightning Network or your own balance. - Send and receive satoshi. - Top up your account with Bitcoin. - Leave a message with every Tip.

Screenshots from Chrome Web Store

Screenshots from Mozilla Add-ons