A great 5 series of talks by one Douglas Crockford on the history of javascript, history of the browser and the future of both. Even though it's a bit old, from 2010, it's still accurate and applicable.
Crockford on JavaScript - Volume 1: The Early Years
https://www.youtube.com/watch?v=JxAXlJEmNMg
The history of javascript
Crockford on JavaScript - Chapter 2: And Then There Was JavaScript
https://www.youtube.com/watch?v=RO1Wnu-xKoY
Explains each built-in type in javscript, along with common errors. A MUST SEE!
Crockford on JavaScript - Act III: Function the Ultimate
https://www.youtube.com/watch?v=ya4UHuXNygM
Everything about functions, "classes", this, inheritance.
Crockford on JavaScript - Episode IV: The Metamorphosis of Ajax
https://www.youtube.com/watch?v=Fv9qT9joc0M
Everything about the DOM and javascript interaction with the DOM.
Crockford on JavaScript - Part 5: The End of All Things
https://www.youtube.com/watch?v=47Ceot8yqeI
Security and performance in both the browser and the javascript language.