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The Cassidy browser extension lets you chat with your Agents while browsing any website. Summarize articles, draft email replies, write LinkedIn messages, and analyze page content — all without leaving your browser tab. The extension works with both Google Chrome and Microsoft Edge.

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Install the extension

1

Open the extension store

Go to the Cassidy AI extension in the Chrome Web Store. You can also access this store from Microsoft Edge.
Cassidy AI extension listing in the Chrome Web Store
2

Add the extension

Click Add to Chrome (in Chrome) or Get (in Edge) to start the installation.
3

Accept the permissions

A dialog will ask for permission to add the extension. Review the request and click Add extension to allow Cassidy to read page content.
Chrome permission dialog asking to add the Cassidy extension
4

Pin the extension (optional)

For quick access, pin Cassidy to your browser toolbar. Click the puzzle piece icon in the toolbar to open the extensions menu, then click the pin icon next to Cassidy.
Extensions menu showing the pin icon next to Cassidy
Once pinned, you’ll see the Cassidy icon in your toolbar. Click it to open the extension and start chatting with your Agents.

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Configure the extension

After installing, you can customize when and how the extension appears.
1

Open settings

Locate the Cassidy tag in the bottom-right corner of your browser window. Hover over it to reveal the gear icon, then click it to open settings.
Cassidy tag in the bottom-right corner of the browser with the settings gear icon revealed on hover
2

Choose display preferences

In the settings menu, configure when to show the Cassidy tag:
  • Show Cassidy icon on all browser tabs — displays the tag on every webpage you visit.
  • Show Cassidy icon when selecting text — displays the tag only when you highlight text on a page.
Cassidy extension settings with display toggle options
Your preferences save automatically when you close the settings menu.
3

Grant page access

When the Agent needs to read your current page, it requests your permission. You can respond in one of three ways:
  • Always allow — the Agent reads the page automatically on every message without prompting again.
  • Allow once — the Agent reads the page for this message only and asks again next time.
  • Deny — the Agent responds without reading the page.
Agent approval card with Always allow, Allow once, and Deny buttons for granting page access
You can change this preference at any time from the Tools dropdown in the chat input area. Toggle View Page on or off to control whether the Agent automatically reads pages.
Tools dropdown in the chat input area showing the View Page toggle enabled

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What you can do with the extension

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Draft email replies

When viewing an email in Gmail, click the Automate button that appears next to the reply buttons. The Cassidy chat panel opens with a suggested prompt based on the email thread, giving you a starting point for your reply.
Gmail email view with the Automate dropdown showing Summarize email thread and Write reply to email options

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Write LinkedIn messages

On LinkedIn, the Automate button appears next to message controls. Click it to open the chat panel with a pre-filled prompt that helps you craft a personalized message based on the conversation context.
Cassidy Automate button on LinkedIn with a suggested message prompt

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Summarize and analyze webpages

Click the Cassidy tag on any webpage to open the chat panel. Ask your Agent to summarize the page, extract key takeaways, or answer questions about the content. The Agent automatically reads the page to provide context-aware responses.
Cassidy extension sidebar summarizing a Forbes article with key takeaways about Apple MacBook Pro

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Work with selected text

Highlight any text on a page to trigger the Cassidy tag (if the display setting is enabled). Click it to open the chat panel with the selected text included, so you can ask your Agent to rewrite it, translate it, explain it, or use it as context for a task.
Highlighted text on a Forbes article with Cassidy extension sidebar showing analysis of the selected text

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Next steps

Build and configure an Agent

Customize the Agent your extension uses with instructions, knowledge, and capabilities.

Outlook extension

Bring Cassidy directly into your Outlook inbox.