Progress is not saved to browser. Played up to wave 10, closed my browser and left for the day, came back and my save was completely wiped. Playing on Firefox and did not do anything else on my browser between closing the game and reopening it later.
Hey, thanks for reporting this, and sorry you lost your run. I tried to recreate it on my end and couldn’t. I tested in standard Firefox, and in a more privacy focused browser (ungoogled Chromium), and both kept progress after fully closing and reopening.
The game saves your progress in your browser’s own storage, so anything that clears site data when the browser closes will wipe it. In Firefox that’s usually one of these:
- Settings -> Privacy & Security -> “Delete cookies and site data when Firefox is closed”
- History set to “Never remember history” or “Clear history when Firefox closes”
- Playing in a private window
- An extension that clears cookies or site data (for example Cookie AutoDelete)
Could you check whether any of those apply to you? If none do, tell me your Firefox version and which Enhanced Tracking Protection setting you use (Standard, Strict or Custom), and I’ll keep digging.
If you want to keep those privacy settings, you can add an exception for the game.