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Browser role-playing games with real progression systems. These are the ones that quietly become a hobby rather than a distraction.
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Browser MMO that has shipped a story release nearly every week since 2008 and looks exactly as Flash-era as you remember.
Cyberpunk progression game where the way forward is writing real JavaScript to automate your own hacking. Learning it is the game.
Space MMO from 2006 still full of people mining, shooting and complaining about the economy, all inside one browser tab.
Single-player browser RPG from the AdventureQuest studio, with a long story campaign and jokes aimed squarely at 2007.
Isometric hack-and-slash that runs in the browser and does a competent impression of Diablo with nothing to install.
Post-apocalyptic comedy RPG with turn-based fights, base building and a tone somewhere between Douglas Adams and a mild fever.
Stick-figure RPG that has been landing daily jokes since 2003, wrapped around a combat and item system far deeper than the drawings imply.
The 2007 build of RuneScape, still updated by player vote and still fully playable in a browser tab you should not have open.
The RPG with the player removed: choose a race, then watch the bars fill for years. Still the sharpest joke about the genre.
Text-based crime MMO running since 2004, where the market, the gyms and the prison are all operated by other extremely committed players.
Modern MUD platform with a proper browser client: play the hosted worlds, or build one yourself without touching a server.
One button, one detour. Press it as often as you like.