What is the Coinbase Extension?
The Coinbase Extension is a lightweight browser wallet that lets you manage crypto assets, sign transactions, interact with decentralized applications (dApps), and perform on-chain swaps directly from your browser. Unlike custodial apps where the exchange holds keys, a browser extension wallet typically stores private keys locally (encrypted) and asks you to confirm actions with a password or hardware device. This guide covers installation, security best practices, common use cases, and troubleshooting.
Why use the extension — when it makes sense
- Convenience: fast access to dApps and in-browser swaps without constantly opening a full application.
- Control: you hold the keys (or pair a hardware wallet) so you decide custody and signing.
- Integration: works with DeFi apps, NFT marketplaces, and web3 services that require a browser wallet connection.
Quick security reminder: Browser extensions trade convenience for an increased attack surface. Follow the security steps below before moving large amounts of value through any browser-based wallet.
Before you install — essential prep
- Use a trusted browser (Chrome, Brave, Edge, or Firefox) and keep it updated.
- Download the extension only from the official source: Coinbase’s website or your browser’s official extension store. Avoid links from social media, DMs, or unknown sites.
- Prepare a secure place to record your recovery phrase — ideally a metal backup or offline paper stored in a safe. Never store your seed phrase in a screenshot, cloud note, or email.
Installing and initializing the Coinbase Extension
- Get the extension: Visit the official Coinbase site (for downloads and trusted links) or the browser’s extension store, then click “Add to browser.”
- Create a new wallet: Open the extension and choose “Create new wallet.” Set a strong password for the extension — this encrypts the local key store.
- Write your recovery phrase: The extension will generate a recovery phrase (typically 12–24 words). Write it down exactly and store it offline in multiple secure locations. This phrase is the only reliable way to recover funds if your device fails.
- Optional — pair a hardware wallet: For improved security, pair a hardware wallet (if supported) and use it to sign sensitive transactions. Hardware wallets keep private keys off your computer entirely.
- Fund and test: Send a small test amount before using the wallet for larger transfers or trades.
Daily use: swaps, sends, and dApp connections
The extension provides a few common actions you’ll use:
- Send/Receive: Use the Receive address shown for an asset and verify incoming addresses carefully. When sending, always confirm the address and network (e.g., Ethereum mainnet vs. a layer-2 network).
- Swaps: Built-in swap functionality lets you trade tokens without leaving the extension. Compare rates and fees, and always confirm swap details presented on the extension screen before approving.
- dApp Connections: When a dApp requests to connect, the extension will show a permission prompt. Only approve connections from dApps you trust and consider using separate browser profiles for experimentation.
Approve with care: Every connection and transaction prompts an approval — read requests carefully (approval might include token spending allowances). Revoke allowances periodically.
Security best practices
- Use hardware wallets for large balances: Pairing a hardware device drastically reduces risk because signing is performed on the hardware device itself.
- Keep the browser clean: minimize installed extensions; some extensions can read or interfere with page content.
- Phishing protection: never enter your seed phrase on any website or paste it into a web page. Official wallet recovery always happens inside wallet software or a hardware device using its own interface.
- Backups: keep multiple, geographically separated copies of your seed phrase backups (in secure forms like metal plates or bank deposit boxes).
- Software updates: keep extension and browser up to date. Treat extension update prompts as routine security maintenance.
Troubleshooting common issues
- Extension not responding: restart your browser and check for conflicting extensions. Use a fresh browser profile to isolate issues.
- Cannot connect to dApp: ensure you’ve allowed the connection and that the dApp supports the connected network. Refresh both sites.
- Lost access: use your recovery phrase to restore the wallet in a fresh installation or on a compatible wallet that supports the same standard.
FAQ — quick answers
Q1: Is the Coinbase Extension custodial or non-custodial?
The browser extension is non-custodial: you control the private keys locally (unless you link an exchange account for custodial services). Your recovery phrase is the ultimate authority for access.
Q2: Can I buy crypto inside the extension?
Some extensions offer fiat on-ramps or links to exchange services. For on-chain swaps, the extension typically supports token-to-token swaps. For fiat purchases, use the official Coinbase platform or in-extension partners where available.
Q3: Should I use a hardware wallet with the extension?
Yes — pairing a hardware wallet is strongly recommended for significant holdings. It ensures private keys never touch your computer.
Q4: How can I recover my wallet if I lose my device?
Install the extension on a new browser or device and choose “Restore wallet.” Enter your recovery phrase exactly as written to regain access to funds.
Q5: How do I revoke a dApp’s permissions?
Most wallets provide a permissions/connected sites area where you can view and remove dApp connections and token approvals. Revoke any permission you no longer need.
Further reading & official resources
Always prefer official sources for downloads and support. For Coinbase-specific documentation and official links, visit the Coinbase website or the official extension listing in your browser’s web store.