How to Check Crypto Browser Extension Permissions in 2026
Crypto browser extensions can connect your wallet, sign transactions, and interact with decentralized apps, but they can also request broad access to browsing data.
Learning how to check crypto browser extension permissions helps you reduce attack surface before a wallet extension or Web3 tool becomes a security risk.
The key is to know which permissions are normal, which are excessive, and where to review them in Chrome, Brave, Firefox, and Edge.
What browser extension permissions actually control
Browser extension permissions determine what an extension can read, change, or access inside your browser.
For crypto tools such as MetaMask, Coinbase Wallet extension, Phantom, Keplr, or Rabby Wallet, permissions may include access to visited websites, tabs, notifications, clipboard data, or host access on specific domains.
These permissions matter because a wallet extension often sits between you and a Web3 site.
If the extension has broader access than needed, a malicious update, phishing site, or compromised extension account can create a path to wallet theft or data leakage.
- Site access: Which websites the extension can read and modify.
- Tabs access: Whether it can see open tabs and tab metadata.
- Notifications: Whether it can send alerts to your desktop.
- Clipboard access: Whether it can read or change copied text.
- Host permissions: Whether it can operate on all sites or only selected domains.
How to check crypto browser extension permissions in Chrome-based browsers
Google Chrome, Brave, Microsoft Edge, and other Chromium-based browsers use similar extension controls.
If your wallet runs in one of these browsers, you can review permissions in the extensions management page.
Check permissions from the extension menu
- Open your browser.
- Click the extensions icon in the toolbar.
- Find your crypto wallet extension.
- Open the extension details or settings.
- Review items such as site access, all websites access, and additional browser features.
In Chrome, you can also go to chrome://extensions.
From there, select the extension and inspect permission details, including what it can read and whether it can run on all sites or only on click.
Check site access settings
Look specifically at site permissions.
For a wallet extension, access should usually be limited to the sites you trust or the sites you actively use for DeFi, NFTs, or staking.
If the extension can access all sites, ask whether that level of access is actually necessary.
Many users allow full access during setup and never revisit it.
That is risky because an extension that can run on every page can potentially observe login forms, session details, and sensitive browser activity.
Check optional permissions and active requests
Some extensions request optional permissions later, after installation.
These may appear after an update or when you enable a feature.
Review any prompts carefully before approving them.
If a wallet extension asks for broad access unrelated to transaction signing or site interaction, pause and verify the request through the official documentation.
How to check crypto browser extension permissions in Firefox
Firefox uses a slightly different extension interface, but the same security principle applies: the fewer permissions, the better.
Open the add-ons manager and inspect each crypto extension individually.
- Click the menu button in Firefox.
- Go to Add-ons and themes.
- Select the crypto wallet or Web3 extension.
- Review its permissions and allowed site access.
Firefox may show permissions such as access to data for certain websites, access to browser tabs, and permissions to display notifications.
Confirm whether these match the extension’s intended function.
A wallet like Keplr, Rabby, or MetaMask should not need unnecessary access to unrelated browsing behavior.
Permissions that are normal for crypto wallet extensions
Not every permission is suspicious.
Some are necessary for a wallet to function with decentralized applications, sign messages, and detect connected sites.
The right question is whether the permission fits the product’s purpose.
- Access to selected websites: Common for interacting with Web3 apps.
- Read and change data on specific sites: Often needed to inject wallet UI and connect to dApps.
- Notifications: Useful for transaction status updates or security alerts.
- Storage: Used to save settings and preferences locally.
A wallet extension should usually justify its permissions clearly in the official documentation, release notes, or store listing.
If the explanation is vague, treat that as a warning sign.
Red flags that suggest overreaching permissions
Some permissions are not automatically malicious, but they deserve scrutiny, especially for crypto-related extensions.
- Access to all websites without a clear functional need.
- Clipboard read/write access when the extension does not obviously manage copied addresses.
- Access to tabs beyond what is needed for dApp detection.
- Frequent permission changes after updates without changelogs.
- Developer requests for unrelated data such as browsing history or cookies.
If you see one of these, check the extension’s official site, GitHub repository, and support forums.
Reputable projects like MetaMask, Ledger Live browser integrations, or established wallet providers typically document why each permission exists.
How to reduce risk without breaking wallet functionality
You do not need to remove every permission to improve security.
In most browsers, you can limit an extension to only the sites you use and approve access site by site.
- Set site access to On specific sites when possible.
- Disable the extension when you are not using DeFi, NFT marketplaces, or staking apps.
- Review permissions after every major update.
- Keep wallet extensions separate from general-purpose productivity extensions.
- Use a dedicated browser profile for crypto activity.
A separate browser profile is especially useful because it isolates your wallet environment from shopping, social media, and email.
That reduces the chance that a malicious page or extension can interact with your crypto workflow.
How to verify whether an extension is trustworthy
Permissions are only one part of wallet safety.
Before installing or keeping a crypto browser extension, verify the developer and distribution source.
- Official browser store listing: Confirm the publisher name and reviews.
- Official website: Match the download link to the developer’s domain.
- Open-source code: Check whether the extension code is public on GitHub or another repository.
- Release history: Look for consistent updates and clear changelogs.
- Community reputation: Check security discussions, audits, and incident reports.
Browser stores can be impersonated, and copycat wallet extensions have appeared in the past.
Always cross-check the publisher name and extension ID with the project’s official site before trusting it with any seed phrase or transaction authority.
What to do if permissions look suspicious
If an extension asks for more access than expected, stop before approving.
Remove the extension, reinstall it from the official source if needed, and verify the request through the project’s support channels.
If you already granted access, revoke it immediately and review recent activity in your wallet.
- Disconnect the extension from all sites.
- Disable or uninstall the suspicious extension.
- Change passwords for related accounts if browser data may have been exposed.
- Move significant funds to a fresh wallet if compromise is possible.
- Check for malicious browser updates or additional unknown extensions.
For high-value wallets, consider using a hardware wallet such as Ledger or Trezor together with a minimal browser extension setup.
Hardware signing reduces the damage caused by browser-level permission abuse.
Checklist for reviewing crypto browser extension permissions
- Confirm the extension publisher is official.
- Inspect site access and limit it where possible.
- Review optional permissions before approving them.
- Remove any extension that requests unrelated browser data.
- Use a separate browser profile for crypto activity.
- Recheck permissions after updates.
Using this process makes it much easier to evaluate wallet extensions like MetaMask, Phantom, Rabby Wallet, Coinbase Wallet extension, and Keplr without guessing.
The safest setup is usually the one that grants only the access required for the specific Web3 tasks you actually use.