If you are new to self custody, one of the first practical choices you face is not which wallet brand to use, but which form factor. Do you install a browser extension, or do you use a mobile app? Both keep your keys on your own device and both count as hot wallets, but the environment each one runs in shapes how it connects to apps, what it protects you from, and what it does not.
This is not a question of which one is objectively better. It is about matching the tool to how you actually use crypto, and understanding the risks specific to each so you can guard against them.
How a browser extension wallet works
A browser extension wallet installs into your browser and injects itself into the pages you visit, most commonly through a standard interface called EIP-1193. When you land on a decentralized app, or dapp, and click "connect wallet," the dapp talks to your extension directly through that injected interface. There is no separate app to switch to and no QR code to scan. This makes extension wallets convenient for people who spend a lot of time in browser based DeFi, since you can have several dapps open in different tabs and approve transactions without leaving the browser.
The tradeoff is that your wallet shares an environment with everything else your browser does. A browser is a general purpose tool that runs code from many different websites, and it is also where phishing pages tend to live. A fake token approval page, a cloned dapp front end, or a malicious ad can all appear in the same tabs as your legitimate dapps. The wallet itself does not browse the web for you, so it cannot tell a real site from a convincing copy. That job falls on you, and on the transaction details the wallet shows before you sign.
Extension wallets also face a specific supply chain risk: fake extensions listed in browser web stores that impersonate a popular wallet, and in rarer cases, legitimate extensions that get compromised through a malicious update. A well run wallet team publishes its extension from a single verified account and makes the official listing easy to find from its own website, but you still have to check that you installed the real one.
How a mobile wallet works
A mobile wallet is a standalone app on your phone. It does not sit inside your mobile browser, so it does not automatically inject itself into every page you visit. Instead, dapps connect to it in one of two ways: through WalletConnect, where the dapp shows a QR code or a deep link and your wallet app opens to approve the session, or through an in-app browser built into the wallet itself, which lets you browse to a dapp from inside the app.
Because a mobile wallet is a separate app rather than something layered onto your everyday browser, it is somewhat more isolated from the phishing pages and malicious ads that show up in normal web browsing. You are less likely to stumble into a fake dapp by accident, since reaching one usually requires actively scanning a QR code or opening a link inside the wallet's own browser.
That isolation is not absolute. WalletConnect sessions carry their own risk: a phishing site can display a legitimate looking WalletConnect QR code, and if you scan it and approve the session without reading what permissions it is requesting, you have connected your wallet to an attacker's dapp just as surely as if you had used an extension. Fake wallet apps also show up in app stores from time to time, so checking the publisher name and review history before installing matters just as much as it does for a browser extension.
Comparing the actual risks
Neither form factor is immune to the core threats in self custody: phishing sites, malicious token approvals, and fraudulent signature requests. What differs is how you tend to encounter them.
On an extension wallet, the main risks come from your browsing habits: opening a phishing link from a search result, an ad, or a message, and interacting with it in the same browser session your wallet lives in. The defense is the same one that applies everywhere in self custody, reading what you are about to sign or approve rather than clicking through, and typing addresses in yourself instead of following links from unsolicited messages. Our articles on connecting your wallet to a dapp safely and checking and revoking token approvals cover that habit in more detail.
On a mobile wallet, the main risks tend to come from QR codes and WalletConnect sessions you approve without reading, plus the usual concern of downloading a fake app in the first place. The defense is reading the permission scope a WalletConnect session asks for, disconnecting sessions you are done with, and only installing wallet apps from your phone's official app store rather than a sideloaded file.
Using both, deliberately
Plenty of people end up using both, and that can be a reasonable setup rather than a compromise. A mobile wallet often works well as a daily driver for everyday sends, receives, and swaps, since it travels with you and is less exposed to browser based phishing. An extension wallet can be useful for desktop DeFi sessions where you are actively researching and interacting with several protocols at once.
If you do run both, treat them as separate tools with separate risk levels rather than two windows into the same balance. Some people keep a lower balance in whichever wallet handles more day to day browser activity, and move larger holdings to a wallet, or to cold storage, that sees less exposure. Our guide on hot wallets and cold wallets walks through how to think about that split.
The habit that matters more than the form factor
Whichever type of wallet you choose, the single habit that protects you most is the same: read what you are approving before you sign it. A transaction request that asks for unlimited token approval, a signature request you do not recognize, or a WalletConnect session tied to a dapp you did not mean to visit are all worth stopping on, regardless of whether they showed up in a browser tab or a phone notification. The wallet's job is to show you clearly what you are about to authorize. Your job is to actually read it before you tap confirm.