Well I clicked your links and they told me nothing about why you liked whatever they are and how they help you.
Frankly, I don't use any special extensions (I may be in the minority here). I can inspect elements in Chrome without an extension (I think) and I can manage the odd jQuery plugin by myself...mostly!
what Chrome extensions do you use at work, while working on webs ?
I use quite a few :)
in the bar
http://minus.com/mbaGTwTDjz/16f
web dev related
http://minus.com/mbaGTwTDjz/17f
b) you do not need to sign up in order to merely view stuff on minus.com
Frankly, I don't use any special extensions (I may be in the minority here). I can inspect elements in Chrome without an extension (I think) and I can manage the odd jQuery plugin by myself...mostly!