Simplify.AI — Chrome Extension

Simplify.AI is a Chrome Extension powered by Chrome's built-in Gemini Nano AI. It lets you instantly summarize and understand any webpage — no external API keys, no data leaving your device.

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Features

• On-device AI — uses Chrome's built-in Gemini Nano (no server, no API key)
• Smart content extraction — automatically finds the main article or body text
• Graceful fallback — works even when Gemini Nano is unavailable, using an intelligent text-analysis summary
• Keyboard shortcut — trigger with Alt+S (Windows/Linux) or Cmd+Shift+S (Mac)
• Clean overlay — results appear in a non-intrusive panel on the page
• Manifest V3 — uses the latest Chrome extension standard with a service worker

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How It Works

User clicks button / presses shortcut
           │
           ▼
    popup.js / background.js
           │
           ▼  chrome.tabs.sendMessage
    content.js  ← extract page text
           │
           ▼  chrome.runtime.sendMessage
    background.js ← AI processing
      ┌────┴────┐
      │         │
  Gemini   Fallback text
   Nano    analysis
      └────┬────┘
           ▼  chrome.tabs.sendMessage
    content.js  ← display result overlay

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Project Structure

SimplifyAI/
├── manifest.json           Extension configuration (MV3)
├── Popup/
│   ├── popup.html          Extension popup UI
│   ├── popup.css           Popup styles
│   └── popup.js            Popup interaction logic
├── background/
│   └── background.js       Service worker — AI processing & command handling
├── content/
│   └── content.js          Page content extraction & result overlay
└── icons/
    └── icon2.png           Extension icon

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Core Files

manifest.json

Defines the extension's metadata, permissions, entry points, icons, and keyboard shortcuts. Uses Manifest V3 — the current Chrome extension standard.

content/content.js

Injected into every webpage. Responsible for:

• Extracting the main text content from the page DOM
• Showing the loading indicator and result overlay on the page
• Relaying messages between the popup/background and the page

background/background.js

Runs as a service worker. Responsible for:

• Handling the Alt+S keyboard shortcut via chrome.commands.onCommand
• Checking whether Gemini Nano is available on this device
• Running the AI summarization (or falling back to text analysis)
• Sending results back to the content script

Popup/popup.html + popup.js + popup.css

The small panel that opens when you click the extension icon. Contains the Simplify This Page button and a status indicator.

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Requirements

Requirement	Details
Chrome version	119+ (for Gemini Nano support)
Gemini Nano	Optional — fallback works without it
Permissions used	activeTab, scripting, tabs

To use the full Gemini Nano AI, enable Chrome's built-in AI at:

chrome://flags/#optimization-guide-on-device-model

Set to Enabled BypassPerfRequirement, then relaunch Chrome.

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Installation (Developer Mode)

1. Open Chrome and navigate to chrome://extensions/
2. Enable Developer Mode (toggle in the top-right corner)
3. Click Load unpacked
4. Select the SimplifyAI/ project folder
5. The extension will appear in your toolbar — pin it for quick access

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Usage

Action	How
Summarize current page	Click the extension icon → Simplify This Page
Keyboard shortcut	Alt+S (Windows/Linux) · Cmd+Shift+S (Mac)
Dismiss result	Click the × button on the overlay panel

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Privacy

• No data is sent to any external server
• All AI processing happens on-device via Gemini Nano
• When Gemini Nano is unavailable, summarization is done entirely in JavaScript with no network calls