A self-custodial crypto wallet built as a browser extension

Latest Version

Version
1.0.0
Update
April 29, 2025
Size
412KiB
Developer
Category
Users
0
Rating
1 ★
Manifest Version
3
Web Store Status
Languages Support
English
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Permissions
Storage
ActiveTab
Scripting
Alarms
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Xell Extension

Xell Wallet is delivered as a lightweight self-custodial browser extension purpose-built for the Rubix Blockchain. Within the extension a user can create a brand-new Rubix wallet or import an existing one simply by entering a BIP-39 mnemonic phrase. Once inside, they enjoy unified management of Rubix’s native RBT token, any fungible tokens (FT) issued on the network, and non-fungible tokens (NFT)—all while retaining absolute control of every private key and the data that surrounds it.
Wallet Creation and Recovery
During creation, Xell generates a 24-word BIP-39 mnemonic and, from that phrase, deterministically derives the user’s private key, public key, and a unique Rubix Decentralized Identifier (DID). The private key is immediately encrypted with a PIN of the user’s choosing, ensuring it never appears on-screen or travels across the internet in plain text. Because the mnemonic is the single source of truth, the same wallet can be re-imported on any device—desktop or laptop—simply by re-entering the 24 words or importing file.
User Onboarding Flow
Terms & Conditions – A clear consent screen ensures the user understands and agrees to the Rubix ecosystem rules.
Username & PIN setup – The user selects a memorable username and a secure PIN that will encrypt their keys and unlock the extension.
Mnemonic backup – Xell displays the 24-word phrase with options to download, copy, or print.
Optional verification step – The user may immediately confirm the phrase or choose to skip and verify later.
Instant access – After these steps, the wallet is provisioned and the user is taken straight to the dashboard.
Dashboard Features
At a glance the dashboard shows the current RBT balance and, via built-in price feeds, its real-time equivalent in multiple fiat currencies such as USD and EUR. Prominent quick-action buttons let users Send RBT, Receive RBT, or Switch Rubix chains without digging through menus. A concise list of recent transactions lives on the main screen, while a separate Transactions page surfaces the complete historical ledger.
Settings and Security
Within Settings, users specify an inactivity timeout (measured in minutes). When that threshold is reached, Xell locks automatically, requiring the PIN to re-enter. From the same panel, users can update their PIN at any time or perform a manual log-out if they prefer.
Web3 Integration & Background Operations
Whenever a Rubix-enabled website requests a signature or token transfer, Xell intercepts the call, prompts the user for approval, and then executes the operation—even if the extension popup has been closed. This is made possible through secure background service workers and selective use of Chrome extension APIs:
activeTab – Detects the currently focused site that initiated the request.
storage – Persists encrypted wallet data entirely in local browser storage.
scripting – Injects a confined script only for the duration of the approved action.
alarms – Powers the auto-logout timer and any scheduled background tasks.
Key Features at a Glance
True self-custody: keys never leave the browser.
Standards-based BIP-39 mnemonic for backup.
PIN-encrypted private-key storage.
Seamless cross-device import with the same mnemonic.
Live balance display plus fiat conversions.
Simple token transfers and searchable transaction history.
Auto-logout driven by configurable inactivity timer.
Background signing for external DApp requests, keeping workflows uninterrupted.
Permissions Justification
activeTab – Needed to read the URL and context of the site asking for a transaction so Xell can display an accurate confirmation.
storage – Allows us to save encrypted keys, user preferences, and settings only on the user’s machine.
scripting – Lets Xell inject a minimal confirmation overlay when, and only when, the user authorizes an action.
alarms – Powers the session-timeout feature and other lightweight scheduled tasks such as periodic balance refreshes.
Privacy Practices Summary
Xell Wallet is privacy-first by design:
We collect zero analytics and transmit no user data to external servers.
Every wallet artifact—private key, public key, DID, balances—remains fully encrypted in local browser storage.
We never share or sell user data in any form.
The mnemonic phrase is the sole means of recovery; only the wallet owner can restore access, ensuring complete data ownership.
Use-case highlights
NFT marketplaces & launchpads – self-custodial minting, royalties on-chain, instant cross-device access.
Blockchain gaming – DID-based sign-in; store in-game currencies, skins and assets under the player’s control.
DeFi protocols – secure swaps, liquidity, and lending with keys kept in-browser.
Token-gated communities & DAOs – verify membership via on-chain holdings, vote securely, unlock premium content.
E-commerce – accept RBT at checkout; instant settlement, lower fees, no chargebacks.
Loyalty & rewards – issue FT/NFT points that customers can trade or redeem.
Supply-chain provenance – sign state changes for goods; build an auditable trail with asset-linked DIDs.
Cross-border payroll & remittances – pay freelancers in RBT; recipients have immediate access.
Subscription media – smart contracts release content when wallet meets access criteria.
Identity & access management – leverage Xell’s DID for password-less logins and verifiable credentials.
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "name": "Xell", "description": "A self-custodial crypto wallet built as a browser extension", "version": "1.0.0", "manifest_version": 3, "action": { "default_popup": "index.html", "default_title": "Xell" }, "icons": { "16": "images/favicon-16x16.png", "32": "images/favicon-32x32.png", "128": "images/android-chrome-192x192.png" }, "permissions": [ "storage", "activeTab", "scripting", "alarms" ], "host_permissions": [ "" ], "web_accessible_resources": [ { "resources": [ "assets/*", "images/*", "injected.js", "process.js", "dummy/*" ], "matches": [ "https://testnet.xellwallet.com/*", "" ] } ], "background": { "service_worker": "background.js", "type": "module" }, "externally_connectable": { "matches": [ "https://testnet.xellwallet.com/*", "" ], "accepts_tls_channel_id": false }, "content_scripts": [ { "matches": [ "https://testnet.xellwallet.com/*", "" ], "js": [ "content.js" ] } ]}
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How to download and manually install Xell extension for Chrome

Looking for a way to install Xell 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 Xell extensions manually, this article outlines two simple methods to effortlessly install Xell extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Xell extension and manually install through Drag &Drop

If you ever need to manually install a Xell 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 Xell Extension by clicking the "Download CRX" button on the website.

Look for the Xell extension you wish to install. Go to the website and download the Xell extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Xell 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 Xell 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 Xell extension for Chrome and install in Developer Mode

This is another method to install Xell 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 Xell extension file

Select and download the Xell 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 Xell 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 Xell 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 Xell 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 Xell extension in 2 ways. We hope this guide proves helpful.

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