RPC provider vs window.ethereum

[glitch-txs]

Hey, if I use
const provider = new ethers.providers.JsonRpcProvider()
Passing my own url (let's say an infura endpoint).
Then when I call a contract for a writing function (e.g. mint a token) the wallet will popup in the frontend dapp (like metamask) and the user will accept this transaction.

My question is will the wallet extension use the RPC endpoint that I'm providing or will it use the ones that are stored in the wallet itself regardless of the dapp?