I Played and still play LOTS of Browser Games, specially Flash Games.

Naming a few, my favorites are:
-Epic Battle Fantasy Series
-Papa Gamerias
-Ducklife 3 & 4
-Necronator
-Kingdom Rush
-Jacksmith
-Dragon Boy 1 & 2
-Age of War
-Flash Bash
-Sands of the Colisseum
-Cactus Mc Coy
-Burrito Bison
-NT Creatures
-Berserk Ball
-Age of Defense 1 to 5
-Infectonator 2
-Bed & Breakfast 3
-Sword & Potions (R.I.P.)
-Miscrits (R.I.P.)
-DragonFable
-Various CN Minigames
I really like them, specially Epic Battle Fantasy, who is my Favorite Game Franchise, (Even including Console Games)

Too Bad Flash is Shuting Down next Year and these Games are not longer reciving support