Duck.ai Sidebar

Warning

This extension is not yet available on the Firefox Add-ons Store; please refer to the original extension for now.

This extension allows you to open the Duck.ai chat interface in the Firefox sidebar, similar to Microsoft Edge's Copilot sidebar.

Duck.ai is an AI service provided by DuckDuckGo, which lets users access various third-party AI chat models for free without sacrificing personal data¹.

Duck.ai is free to use, but there is a daily limit on usage². DuckDuckGo Pro subscribers have access to higher usage limits than the free version of Duck.ai².

Features

Duck.ai and Duck.ai Sidebar extension features.

Click here to expand/collapse Duck.ai's features.

Duck.ai Features	Description
AI Chat	Allows you to have private conversations with 3rd-party AI chat models, anonymized by DuckDuckGo1.
AI Voice Chat	Allows you to have private voice conversations with an OpenAI model3, anonymized by DuckDuckGo1.
AI Image Creation	Allows you to create AI-generated images using GPT Image 2.

Click here to expand/collapse the Sidebar's features.

Sidebar Features	Status
Access to Duck.ai and it's features in a Sidebar.	Implemented
Ask Duck.ai about selected text on a webpage, using the context menu.	Planned
Ask Duck.ai to summarize the current webpage, using the context menu.	Planned

Base Models

Note

GPT-4o mini and Llama 4 Scout will be leaving Duck.ai on June 15, 2026. After that, you can switch models to continue your chats.

As of April 2026, Duck.ai offers the following models to all users:

Click here to expand/collapse base AI models.

Model	Zero provider visibility4	Open Source	File Upload (PDF)	Image Upload	Web Search	Category	Built-in Moderation	Created By	Documentation
GPT-5 mini	❌	❌	✔️	✔️	✔️	Reasoning AI	High	OpenAI	OpenAI API
GPT-4o mini	❌	❌	❌	✔️	✔️	General-purpose AI	High	OpenAI	OpenAI API
GPT-OSS 120B [BETA]	✔️4	✔️	❌	❌	❌	Reasoning AI	High	OpenAI	OpenAI API
Llama 4 Scout	❌	✔️	❌	❌	❌	General-purpose AI	Medium	Meta	Llama Docs
Claude Haiku 4.5	❌	❌	✔️	✔️	✔️	Reasoning AI	High	Anthropic	Claude API
Mistral Small 4	❌	✔️	❌	❌	❌	General-purpose AI	Low	Mistral AI	Mistral Docs

Advanced Models

Additionally, users with a DuckDuckGo subscription can access advanced models:

Click here to expand/collapse advanced AI models.

PLUS Models⁵

Model	Zero provider visibility4	Open Source	File Upload (PDF)	Image Upload	Web Search	Category	Built-in Moderation	Created By	Documentation
GPT-4o	❌	❌	✔️	✔️	✔️	General-purpose AI	High	OpenAI	OpenAI API
GPT-5.2	❌	❌	✔️	✔️	✔️	Reasoning AI	High	OpenAI	OpenAI API
Claude Sonnet 4.5	❌	❌	✔️	✔️	✔️	Reasoning AI	High	Anthropic	Claude API
Llama 4 Maverick	❌	✔️	❌	❌	❌	General-purpose AI	Medium	Meta	Llama Docs

PRO Models⁶

Model	Zero provider visibility4	Open Source	File Upload (PDF)	Image Upload	Web Search	Category	Built-in Moderation	Created By	Documentation
Claude Opus 4.6	❌	❌	✔️	✔️	✔️	Reasoning AI	High	Anthropic	Claude API

Credits

The original extension was created by @yookoala.

License

This software is distributed under the MIT License. A copy of the license is distributed along with the source code here.

Footnotes

1. Duck.ai's Privacy Policy and Terms of Service provide more details on how user data is handled. ↩ ↩² ↩³

2. See Duck.ai's usage limits for more information. ↩ ↩²

3. OpenAI is the model provider for all voice chats. ↩

4. "GPT-OSS 120B runs in a Trusted Execution Environment. This means not even the model provider can see your prompts or the model’s responses, or save the chat on their servers." ↩ ↩² ↩³ ↩⁴

5. Requires the DuckDuckGo PLUS subscription tier. ↩

6. Requires the DuckDuckGo PRO subscription tier. ↩