Opera browser introduces the crypto wallet in Opera Lab version desktop browser for all Linux, Mac and Windows. You did not need to install any app is an extension for the crypto wallet. Opera inbuilt the crypto wallet in the browser itself.
Opera says in the blog:
This means you can now pair your desktop browser with the built-in crypto wallet in your Opera for Android mobile browser. Every time a website or Dapp requires you to sign a transaction or message, a prompt will appear on your phone for you to confirm with your fingerprint. No need to set up a different wallet for the desktop. Your wallet keys remain stored on the secure hardware of your mobile phone and are never transmitted.
The Opera desktop browser Labs build will install on your system separately from your stable Opera browser.
The crypto wallet in Opera for Android is a user-controlled wallet, which means that the keys controlling the funds and assets are stored on the user’s phone and nowhere else. The crypto wallet supports tokens and collectibles. Collectibles are digital, unique “things” you can own on a public blockchain.
Download the opera lab version in your desktop and install the lab version. After install open the opera browser you can see the wallet icon in the side menu bar. Just click the Wallet icon it will open the cryptocurrency window in the browser just signup with the Gmail account and scan the code in the android device. And make the transaction.
This only available for Android now.