About this extension

MetaMask Flask is a distribution channel of the MetaMask extension for developers that gives them access to additional unstable APIs. The goal of Flask is to maximize developer control, so that we can learn the full extent of what developers want to do with MetaMask, and later incorporate those lessons into the main MetaMask distribution.

MetaMask is an extension for accessing Ethereum enabled distributed applications, or "Dapps" in your browser!

The extension injects the Ethereum web3 API into every website's javascript context, so that dapps can read from the blockchain.

MetaMask also lets the user create and manage their own identities (via private keys, local client wallet and hardware wallets like Trezor™), so when a Dapp wants to perform a transaction and write to the blockchain, the user gets a secure interface to review the transaction, before approving or rejecting it.

Because it adds functionality to the normal browser context, MetaMask requires the permission to read and write to any webpage. You can always "view the source" of MetaMask the way you do any Chrome extension, or view the source code on Github:

https://github.com/MetaMask/metamask-extension
Enables access to:
Web 3.0
Dapps
NFTs
erc20
tokens
ICOs
erc271
...and more!

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Release notes for 12.9.0.150

## [12.9.0]
### Added
- Added error handling to ensure users are not redirected to an incorrect network when sending or swapping tokens ([#28740](https://github.com/MetaMask/metamask-extension/pull/28740))
- Added optional chaining to currency rates check for improved stability ([#28753](https://github.com/MetaMask/metamask-extension/pull/28753))
- Enabled Portfolio View ([#28661](https://github.com/MetaMask/metamask-extension/pull/28661))
- Added a selector to enable cross-chain polling for aggregated balances ([#28662](https://github.com/MetaMask/metamask-extension/pull/28662))
- Ensured the network filter respects the PortfolioView feature flag, displaying tokens accordingly ([#28626](https://github.com/MetaMask/metamask-extension/pull/28626))
- Implemented multichain token detection, enabling periodic polling and storing detected tokens across all supported networks ([#28380](https://github.com/MetaMask/metamask-extension/pull/28380))
- Added PortfolioView to display tokens across all networks in one list ([#28593](https://github.com/MetaMask/metamask-extension/pull/28593))
- Added cross-chain aggregated balance calculation ([#28456](https://github.com/MetaMask/metamask-extension/pull/28456))
- Enabled redesigned transaction confirmations for all users, with automatic toggling ([#28321](https://github.com/MetaMask/metamask-extension/pull/28321))
- Added a first-time interaction warning to alert users when interacting with an address for the first time ([#28435](https://github.com/MetaMask/metamask-extension/pull/28435))
- Added a default value to the custom nonce modal ([#28659](https://github.com/MetaMask/metamask-extension/pull/28659))
- Added an alert when the selected account differs from the signing account in the confirmation screen ([#28562](https://github.com/MetaMask/metamask-extension/pull/28562))
- Display "< 0.01" instead of "0.00" for the fiat value of network fees ([#28543](https://github.com/MetaMask/metamask-extension/pull/28543))
- Improved handling of very long names by truncating names longer than 15 characters with an ellipsis ([#28560](https://github.com/MetaMask/metamask-extension/pull/28560))
- Enabled account syncing in production ([#28596](https://github.com/MetaMask/metamask-extension/pull/28596))
- Added various updates to account syncing in preparation for re-enablement ([#28541](https://github.com/MetaMask/metamask-extension/pull/28541))
- Added entry points to the Portfolio for viewing and managing spending caps from the extension ([#27607](https://github.com/MetaMask/metamask-extension/pull/27607))

### Changed
- Updated the new network popup to only display for compatible accounts ([#28535](https://github.com/MetaMask/metamask-extension/pull/28535))
- Removed the "You're now using..." network modal after adding a network ([#28765](https://github.com/MetaMask/metamask-extension/pull/28765))

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