Installing the extension

The Ultrathink browser extension is the fastest way to capture web content. It lets you save articles, AI conversations, screenshots, and selected text directly to your knowledge base with a single click. This guide covers installation on Chrome and Edge, pinning the extension to your toolbar, and connecting it to your account with a device key.

Supported browsers

The extension works with Chromium-based browsers:

Browser	Supported	Notes
Chrome	Yes	Version 127 or later recommended for screenshot capture
Edge	Yes	Installs from the Chrome Web Store
Brave	Yes	Enable extension support in settings first
Firefox	No	Not currently supported
Safari	No	Not currently supported

Installing from the Chrome Web Store

This is the recommended installation method for most users.

1. Open the Chrome Web Store in your browser
2. Search for Ultrathink
3. Click the Ultrathink extension in the results
4. Click Add to Chrome
5. In the confirmation dialog, click Add extension

The extension installs in a few seconds. You will see a brief confirmation message and the Ultrathink icon appears in your extensions area.

Pinning the extension to your toolbar

By default, newly installed extensions may be hidden behind the puzzle piece icon in your toolbar. Pinning the extension gives you one-click access.

1. Click the puzzle piece icon (Extensions) in your browser toolbar
2. Find Ultrathink in the list
3. Click the pin icon next to it

The Ultrathink icon now appears permanently in your toolbar, making it easy to capture content at any time.

Installing on Edge

Edge uses the Chrome Web Store for extensions. The process is almost identical:

1. Open the Chrome Web Store in Edge
2. If prompted, click Allow extensions from other stores at the top of the page
3. Search for Ultrathink and click Add to Chrome
4. Confirm by clicking Add extension
5. Pin the extension to your toolbar using the same steps as above

Developer installation

If you are testing a development build or need to install the extension from source, you can load it manually.

1. Download or clone the extension source folder to your computer
2. Open your browser and go to chrome://extensions
3. Enable Developer mode using the toggle in the top right corner
4. Click Load unpacked
5. Select the ultrathink-extension folder on your computer
6. The extension appears in your extensions list

Note: Developer installations do not auto-update. You will need to click the refresh icon on the extension card in chrome://extensions after pulling new changes.

Connecting the extension to your account

The extension uses a device key for authentication instead of a username and password. This means you only need to set it up once, and it stays connected across browser sessions.

Getting your device key

You create device keys in the Ultrathink web app:

1. Log in to tryultrathink.com
2. Go to Settings then Device Keys
3. Click Create New Key
4. Give the key a descriptive name (for example, "Work laptop Chrome" or "Home desktop Edge")
5. Copy the generated key to your clipboard

Tip: Name your keys after the device and browser they are used on. This makes it easy to identify and revoke keys later if you switch devices.

Entering your device key

Once you have your key copied, configure the extension:

1. Click the Ultrathink extension icon in your toolbar
2. Click the gear icon (Options)
3. Paste your device key into the Device Key field
4. Click Save

The extension validates the key and confirms the connection. Your key is stored securely in Chrome's local storage and syncs across your Chrome profile, so you will not need to enter it again on the same profile.

Managing device keys

You can create as many device keys as you need. Each key can be independently revoked without affecting your other devices.

Action	Where to do it
Create a new key	Settings then Device Keys then Create New Key
View active keys	Settings then Device Keys
Revoke a key	Click the delete icon next to the key in Settings

If you revoke a key, the extension on that device stops working until you enter a new key.

Verifying the installation

After installing and connecting, verify that everything is working:

1. Navigate to any web page
2. Click the Ultrathink extension icon in your toolbar
3. The capture popup should appear, showing:
   • The page title (auto-extracted)
   • The detected content type
   • A notes field for your thoughts

If the popup appears and shows the page information, your extension is set up and ready to use.

Customising keyboard shortcuts

The extension comes with default keyboard shortcuts:

Action	Windows and Linux	Mac
Open capture popup	Ctrl+Shift+4	Cmd+Shift+4
Screenshot capture	Ctrl+Shift+5	Cmd+Shift+5

To change these shortcuts:

1. Go to chrome://extensions/shortcuts in your browser
2. Find Ultrathink in the list
3. Click the pencil icon next to the shortcut you want to change
4. Press your preferred key combination
5. The new shortcut is saved automatically

Extension permissions

The extension requests a minimal set of permissions to function:

Permission	Why it is needed
activeTab	Read the content of the page you are currently viewing when you capture it
tabs	Access tab URLs for bulk tab capture
scripting	Inject content scripts to extract text and metadata from pages
storage	Store your device key locally

The extension only accesses pages when you explicitly choose to capture them. There is no background tracking or data collection.

Troubleshooting

The extension icon does not appear

• Check that the extension is enabled at chrome://extensions
• Make sure you have pinned it to your toolbar
• Try restarting your browser

"Invalid device key" error

1. Go to Settings then Device Keys in the web app
2. Check that the key has not been revoked
3. Create a new key if needed
4. Paste it into the extension options, making sure there are no extra spaces before or after the key

The popup shows no page information

• Try refreshing the page before clicking the extension icon
• Some pages (such as chrome:// internal pages) cannot be captured
• Check the browser console for error messages

Next steps

With the extension installed and connected, you are ready to make your first capture. The next guide walks you through capturing content and seeing how Ultrathink processes it with AI.