Browser games you have burned a lot of time on?
Personally I've played a hell of a lot of HexArena. Just a simple, low intensity game that runs well and is maintained :))
And before anyone says it, chess and go are great browser games!
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Slither.io is definitely my most played browsergame. It gets way more fun with a mod that lets you zoom out a little, as the bigger you get the worse the experience normally gets..