Chrome, Edge, Brave, Opera: Settings, System, turn on Use graphics acceleration when available, then Relaunch.
Firefox: Settings, General, Performance: untick Use recommended performance settings, tick Use hardware acceleration when available, then restart Firefox.
Safari: hardware acceleration is always on; update macOS if the game does not start.
Laptops with two graphics chips: let the browser use the faster one (Windows: Settings, System, Display, Graphics).