Here is my must have Google Chrome extension list of this year. Feel free to suggest your own in comment section!
Security and Privacy
µBlock
Block annoying ads from being displayed on your screen. I prefer this ad blocker from Ad Block Plus because the later extensions enabled whitelisted ads by default. µBlock also uses less memory footprin, and give faster performance than ABP (source).
Ghostery
Hide your PC from being tracked by various trackers.
Function enhancement
Image Zoom
Preview images when hovering on image links and thumbnails.
Save to Pocket
Cross-platform bookmark-replacement tools. Easily bookmark a link so you can read it later!
Emoji Input
Displays Emoji in Google Chrome, as well as use it in text boxes!
Reddit Enhancement Suite
For Redditors, this is a must have tools. Makes your Reddit browsing experience better than ever!
Chrome Remote Desktop
Easily remote your desktop from outside, whenever you want to.
Entertainment
Your Quality for YouTube™
Disable auto quality adjustment in Youtube.
Web Development
Wappalyzer
Displays web technologies being used on a website. Useful to check what CMS being used.
JSONView
Displays and validate JSON formatted data.
Check My Links
Validate all links in current page so you can fix them before launching your site online!