I'm also seeing Chrome crash on Windows or on ChromeOS, after maybe 30-45 minutes of play (although it happened once after less than 10 minutes), on both the 7DRL version and the current release. The entire renderer tab is dying, which suggests out-of-memory or a browser bug.
The tab can sit there unplayed for a day or more, so it's not a steady-state memory leak, but something triggered by interaction.
Taking memory snapshots using Chrome DevTools, the javascript heap is growing around 300-600 kb per exit node transited; that's shouldn't be enough to crash the renderer unless you're hacking hundreds of networks.