Extensions I have found useful (with links where possible)
- Amazon Assistant
- Boomerang for Gmail
- Buffer
- DuckDuckGo
- Facebook Flat
- Google +1
- Great Suspender
- From Google
- Cast
- Docs Offline
- Hangouts
- Page Analytics
- Save to Google Drive
- Translate
- Voice
- HD for YouTube
- HTTPS Everywhere
- Pin It
- Rapportive
- reddit companion
- Save to Pocket
- Sidekick
- Tools for Google Maps
- uBlock