THIS IS THE CANARY DISTRIBUTION OF THE METAMASK EXTENSION, INTENDED FOR DEVELOPERS.

Latest Version

Version
12.9.0-flask.0
Update
December 10, 2024
Size
22.17MiB
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Category
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7,000+
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Manifest Version
3
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Permissions
ActiveTab
Alarms
ClipboardWrite
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Scripting
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UnlimitedStorage
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MetaMask Flask DEVELOPMENT BUILD 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.

You can find the main / production version of MetaMask here: https://chrome.google.com/webstore/detail/metamask/nkbihfbeogaeaoehlefnkodbefgpgknn

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!
Read more

Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "action": { "default_icon": { "16": "images/icon-16.png", "19": "images/icon-19.png", "32": "images/icon-32.png", "38": "images/icon-38.png", "64": "images/icon-64.png", "128": "images/icon-128.png", "512": "images/icon-512.png" }, "default_title": "MetaMask", "default_popup": "popup-init.html" }, "author": "https://metamask.io", "background": { "service_worker": "scripts/app-init.js" }, "commands": { "_execute_browser_action": { "suggested_key": { "windows": "Alt+Shift+M", "mac": "Alt+Shift+M", "chromeos": "Alt+Shift+M", "linux": "Alt+Shift+M" } } }, "content_scripts": [ { "matches": [ "file://*/*", "http://*/*", "https://*/*" ], "js": [ "scripts/disable-console.js", "scripts/lockdown-install.js", "scripts/lockdown-run.js", "scripts/lockdown-more.js", "scripts/contentscript.js" ], "run_at": "document_start", "all_frames": true }, { "matches": [ "*://connect.trezor.io/*/popup.html*" ], "js": [ "vendor/trezor/content-script.js" ] } ], "default_locale": "en", "description": "THIS IS THE CANARY DISTRIBUTION OF THE METAMASK EXTENSION, INTENDED FOR DEVELOPERS.", "host_permissions": [ "http://localhost:8545/", "file://*/*", "http://*/*", "https://*/*" ], "icons": { "16": "images/icon-16.png", "19": "images/icon-19.png", "32": "images/icon-32.png", "38": "images/icon-38.png", "48": "images/icon-48.png", "64": "images/icon-64.png", "128": "images/icon-128.png", "512": "images/icon-512.png" }, "manifest_version": 3, "name": "MetaMask Flask DEVELOPMENT BUILD", "permissions": [ "activeTab", "alarms", "clipboardWrite", "notifications", "scripting", "storage", "unlimitedStorage", "webRequest", "offscreen" ], "sandbox": { "pages": [ "snaps/index.html" ] }, "short_name": "__MSG_appNameFlask__", "content_security_policy": { "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'none'; frame-ancestors 'none';", "sandbox": "sandbox allow-scripts; script-src 'self' 'unsafe-inline' 'unsafe-eval'; object-src 'none'; default-src 'none'; connect-src *;" }, "externally_connectable": { "matches": [ "https://metamask.io/*" ], "ids": [ "*" ] }, "minimum_chrome_version": "89", "version_name": "12.9.0-flask.0", "version": "12.9.0.150", "browser_action": { "default_icon": { "16": "images/icon-16.png", "19": "images/icon-19.png", "32": "images/icon-32.png", "38": "images/icon-38.png", "64": "images/icon-64.png", "128": "images/icon-128.png", "512": "images/icon-512.png" }, "default_title": "MetaMask Flask" }}
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How to download and manually install MetaMask Flask DEVELOPMENT BUILD extension for Chrome

Looking for a way to install MetaMask Flask DEVELOPMENT BUILD extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install MetaMask Flask DEVELOPMENT BUILD extensions manually, this article outlines two simple methods to effortlessly install MetaMask Flask DEVELOPMENT BUILD extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download MetaMask Flask DEVELOPMENT BUILD extension and manually install through Drag &Drop

If you ever need to manually install a MetaMask Flask DEVELOPMENT BUILD extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the MetaMask Flask DEVELOPMENT BUILD Extension by clicking the "Download CRX" button on the website.

Look for the MetaMask Flask DEVELOPMENT BUILD extension you wish to install. Go to the website and download the MetaMask Flask DEVELOPMENT BUILD extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for MetaMask Flask DEVELOPMENT BUILD extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the MetaMask Flask DEVELOPMENT BUILD extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download MetaMask Flask DEVELOPMENT BUILD extension for Chrome and install in Developer Mode

This is another method to install MetaMask Flask DEVELOPMENT BUILD extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the MetaMask Flask DEVELOPMENT BUILD extension file

Select and download the MetaMask Flask DEVELOPMENT BUILD extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the MetaMask Flask DEVELOPMENT BUILD extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your MetaMask Flask DEVELOPMENT BUILD extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the MetaMask Flask DEVELOPMENT BUILD extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install MetaMask Flask DEVELOPMENT BUILD extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Alvar1to (ID: 0000001dd422e0ed) Voted 1 ★ - Updated 04/17/2023 SCAM. ESTAFA. No es oficial y te robarán tus fondos. Isn't official and your funds will be stolen.

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Rahul Kumar (ID: 000000241b54bc24) Voted 5 ★ - Updated 12/21/2022 love it

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Joseph Christopher Pimentel (ID: 000000a0638159b1) Voted 5 ★ - Updated 08/16/2022 Love this tool use for father improving Metamask

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Ẩn Trần (ID: 000000d9f0ed27aa) Voted 1 ★ - Updated 07/30/2022 SCAM

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Heather Graham (ID: 000000fc91ae2d7a) Voted 5 ★ - Updated 02/03/2022 scam