- uBlock Origin - Adblocking
- OneTab - Tab management. I use it as a read later app.
- Raindrop.io - Bookmark Management.
- Panda - News aggregator in your new tab screen. Very useful. It keeps me updated on the latest news on various fields.
- OctoTree - Shows a code tree on github. It helps in quickly accessing files inside a repository.
- Github Hovercard - Shows brief details about the user, issues, PRs in github as hovercards.
- Grammarly - May not be for everyone. This helps me keep my grammar in check.
I also love and use wappalyzer.