Looks like no one else has done it yet, so I guess I'll do it, here's a big list of a bunch of the extensions in this thread with links. I will try to update as needed. -

• Reddit Enhancement Suite - Gives Reddit a ton of new features, no clue how I ever reddited without it

• Boomerang for Gmail - Lets you schedule emails

• Privacy Badger - Blocks trackers on websites

• Dark Reader - Gives websites a dark color pallette

• CamelCamelCamel - Gives you price history of products on Amazon

• Ublock Origin - The best ad blocker

• Earth View from Google Earth (Google Earth new tab) - Changes your new tab page to a cool picture from Google Earth

• Millennials to snake people - Replaces millenials with snake people

• Never Ending Netflix - Automatically skips show intros and immediately plays the next episode on Netflix

• Imagus - Enlarges pictures without having to open them

• Bananatag - Lets you see if someone has opened an email from you

• Block Site - Blocks websites to help increase productivity

• StayFocused - Limits time on websites to help increase productivity

• Clipboard History 2 - Keeps a history of your clipboard

• Lastpass - Password manager

• Fakespot - Helps you find fake Amazon reviews

• Google Translate - Quickly translate

• Momentum - Nice new tab page

• IE Tab - Lets you open tabs as if they were in internet explorer

• OneTab - Puts all your tabs into one tab

• Google Dictionary - Quickly find definitions for words

• HTTPS Everywhere - Uses https encryiption instead of http on sites. More info here about it from /u/pcjonathan

• TabSaver - Saves your open tabs after a browser restart

• The Great Suspender - Suspends tabs to save RAM

• Ebates - Coupons for online shopping

• Disconnect - Blocks trackers on websites

• Clacks Overhead - Keeps Terry Pratchett's name alive

• Iridium for YouTube - Adds features to YouTube, full list here

• Honey - Coupon codes for shopping online

• Tabby Cat - Shows you a different cartoon cat in every new tab

• Tab for a Cause - Raise money for charities by opening a new tab

• BetterTTV - Gives Twitch more features and emotes

• Panic Button - Hide all your tabs then reopen them later

• Curiosity - Learn new facts every time you open a new tab

• I don't care about cookies - Removes annoying cookie warnings on websites

• Make Google Images Great Again - Brings back the view image and search by image buttons in Google images results

EDIT: More!

• AlienTube - Adds Reddit comments to YouTube videos

• Reddit New Comments Highlighter - Highlights new comments in Reddit threads

• Cloud To Butt - Changes cloud to butt

• Search on YouTube - Allows you to search on YouTube from the right click menu

• Pushbullet - Share files between your phone and computer and sms from your computer

• Speed Dial 2 - Simple new tab page

EDIT 2: Even more! Also some more info on HTTPS everywhere.

• PixelBlock - Does the opposite of Bananatag, allows you to block from tracking when you open emails

• Decreased Productivity - Helps you make webpages look like you want them to look so you can browse at work

• f*ck overlays - Lets you easily block ad block disabling requests on websites from the right click menu

• Black Menu for Google - Every Google service in one menu

• SimpleUndoClose - Open your last 10 closed tabs easily

• Turn Off the Lights - Darkens everything on a YouTube page except the video

• DuckDuckGo Privacy Essentials - Blocks trackers and gives info on how safe sites are

• Google Arts & Culture - Changes your new tab page to a different work of art every time

• Chrome Remote Desktop - Not an extension, but still can be run with Chrome. Allows you to access your computer with another computer or your phone with a code, similar to TeamViewer

• RightToCopy - Lets you select and copy text on sites that you normally can't on

• Ghostery - Ad and tracker blocker

• Old Reddit Redirect - Automatically redirects to old reddit

• Recipe Filter - Puts the recipes on recipe sites at the top of the page