Open-source AI browser extensions
Translate, summarize and chat in a side panel.
Multiple AI agents operate web pages in your Chrome — comparing prices, filling forms, gathering data — using your own LLM API key.
Similar to OpenAI Operator or Comet, but fully open source and running in your local browser, so your logged-in sessions never go to a cloud service.
InstallChrome Web Store: search “Nanobrowser”Inserts translations under each paragraph of a web page for side-by-side bilingual reading, and also translates input boxes, subtitles and selected text. Works with DeepL, Google, OpenAI-compatible APIs or local Ollama.
Minimal UI and customizable rules, available as both an extension and a userscript. An open-source alternative to Immersive Translate's paid features, with Traditional Chinese output.
InstallSearch “KISS Translator” in the Chrome Web Store, Microsoft Edge Add-ons or Firefox Add-ons, or install the userscriptCall AI from a floating window on any page: translate selections, summarize, show answers next to search results. Supports many APIs and web-app accounts.
Long-running and still maintained, with support for Chrome, Edge, Firefox and Safari. Good for anyone who wants a general-purpose AI toolbar.
InstallSearch “ChatGPTBox” in the Chrome Web Store, Microsoft Edge Add-ons or Firefox Add-onsUses an LLM for bilingual web page translation and explains words, phrases and grammar at your level, turning foreign-language browsing into language learning.
New in 2025 but updated frequently. Puts translation and language learning in one sidebar; bring your own OpenAI, DeepSeek or other API key.
InstallChrome Web Store: search “Read Frog”Chat with local models from Ollama, LM Studio and others in a browser sidebar, and ask questions about the current page or PDF.
Data stays on your machine and no account is needed — the easiest way to bring local models into everyday browsing. Works in Chrome and Firefox.
InstallSearch “Page Assist” in the Chrome Web Store or Firefox Add-ons
Updated Oct 25, 2026 · ★ GitHub