Your vault is a contract on the blockchain that you own. WalletBrake can approve payments within your limits and freeze your vault, but it can never move your money, keep it frozen, or stop you leaving. If WalletBrake ever disappears or stops working, this page lets you freeze your vault and move everything to your backup address yourself.
It talks to the blockchain only through your own wallet: nothing here goes to WalletBrake's servers. You can save it (File → Save page) and open the saved copy later in a browser with your wallet installed.
Any tool that can send a contract call works, such as your wallet's own "send to contract" feature or a block explorer's Write contract tab. The vault's functions: freeze(), then emergencyWithdraw(token) for each coin (use 0x0000000000000000000000000000000000000000 for the network's own coin), from the owner wallet. If the owner wallet is lost, the backup address calls startRescue(), waits the rescue period (30 days unless you changed it), then anyone can call rescue(token), which only ever pays the backup address. The docs explain each step.