Firefox

Well, how do I start it :D, I've no comments :).

• It's fast.
• Easy to use.
• Light.
• Extendable.

Positive side:

• Native Tab Grouping.
• Native tab pinning.
• Fast and light UI.
• The coolest alert dialog ever :).
  Each dialog belongs to it's tab, no more modal dialogs, yea fuck you spammers !!!
  

Negative side:

• Intestinally left blank ....