What are some of your must have browser extensions?

I recently made an effort to switch to Firefox, and now I'm looking for some good browser extensions to make my web browsing experience better. Here are the ones I currently use:

• HTTPS Everywhere
• Privacy Badger
• uBlock Origin
• Vimium

Desert Island Dump

• Chapter 1: Shipwrecked

• Chapter 2: The Big Haul

• Chapter 3: "Stolen from Talley's"

Here's an abriged version: Henderson Island: the Pacific paradise groaning under 18 tonnes of plastic waste

And a video of the beach.

It can be specific or broad, and it can be aimed at a particular type of person based on your experiences (e.g. people in my city, people with fibromyalgia, etc.) or just people at large.

Also, given that age is a very identifying piece of information, feel free to give a range if you're not comfortable sharing your exact age (e.g. "I'm in my 40s" rather than "I'm 42").

• What advice or wisdom would you give to someone 10 years younger than you?
• What would you have wanted to know 10 years ago that someone older could have shared with you?
• If you'd heard the kind of advice you're giving, would you have listened to it 10 years ago?