Closehold by Closehold LLC

Protects confidential information before it reaches AI tools — on your device, reversibly, with nothing sent to us.

About this extension

Closehold is the AI data boundary. It protects sensitive information in the moment it would cross into an AI tool — and puts it back in the answer.

HOW IT WORKS
Type into ChatGPT, Claude, Gemini, Copilot and other AI tools exactly as you always do. When you press send, Closehold detects confidential material — names, identifiers, account numbers, financial details, privileged content — and replaces it with reversible placeholders before the prompt leaves your browser. When the answer comes back, the real values are restored in place. The AI service never sees the original; you never see a placeholder.

EVERYTHING RUNS ON YOUR DEVICE
This extension is a thin bridge to the Closehold desktop application running on your own machine (127.0.0.1). Detection, redaction and restoration all happen locally. The extension sends nothing to Closehold's servers — there is no account inside the extension, no analytics, no tracking, and no content collection of any kind.

REQUIRES
The Closehold desktop application (provided to pilot participants). The extension pairs with it automatically and shows its protection status beside your AI conversations.

FILE PROTECTION
Files attached to AI conversations are checked the same way: a protected copy is what uploads, and the original never leaves your machine.

Closehold — The AI Data Boundary.

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Permissions and data

Required permissions:

Exchange messages with programs other than Firefox
Block content on any page
Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for copilot.microsoft.com
Access your data for m365.cloud.microsoft
Access your data for copilot.cloud.microsoft
Access your data for poe.com
Access your data for chat.mistral.ai
Access your data for chat.deepseek.com
Access your data for meta.ai
Access your data for huggingface.co
Access your data for coral.cohere.com
Access your data for replit.com
Access your data for grok.com
Access your data for aistudio.google.com
Access your data for groq.com
Access your data for openrouter.ai
Access your data for pi.ai
Access your data for chat.qwen.ai
Access your data for kimi.com
Access your data for phind.com
Access your data for chat.reka.ai
Access your data for character.ai
Access your data for you.com
Access your data for duck.ai
Access your data for duckduckgo.com
Access your data for www.google.com
Access your data for mail.google.com
Access your data for outlook.office.com
Access your data for outlook.live.com

Optional permissions:

Access your data for 127.0.0.1
Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for copilot.microsoft.com
Access your data for m365.cloud.microsoft
Access your data for copilot.cloud.microsoft
Access your data for poe.com
Access your data for chat.mistral.ai
Access your data for chat.deepseek.com
Access your data for meta.ai
Access your data for huggingface.co
Access your data for coral.cohere.com
Access your data for replit.com
Access your data for grok.com
Access your data for aistudio.google.com
Access your data for groq.com
Access your data for openrouter.ai
Access your data for pi.ai
Access your data for chat.qwen.ai
Access your data for kimi.com
Access your data for phind.com
Access your data for chat.reka.ai
Access your data for character.ai
Access your data for you.com
Access your data for duck.ai
Access your data for duckduckgo.com
Access your data for www.google.com
Access your data for mail.google.com
Access your data for outlook.office.com
Access your data for outlook.live.com

Data collection:

The developer says this extension doesn't require data collection.