git clone https://github.com/ethereum/remix.git # only if you plan to link remix and remix-ide repositories and develop on it.
cd remix-ide
npm install
npm run setupremix # this will clone https://github.com/ethereum/remix for you and link it to remix-ide. Only execute this step if you want to contribute on Remix development
npm run setupremix # only if you plan to link remix and remix-ide repositories and develop on it.