NYSE Top 50 Trades 作者： Libor Benes (Dr. B)

📈 NYSE Top 50 Trades brings the pulse of The New York Stock Exchange directly into your Firefox sidebar — live prices, percentage changes, and trading volume for 50 blue-chip NYSE stocks, refreshed every 60 seconds.

🔍 WHAT IT DOES:
Operating as a persistent Firefox sidebar, the extension fetches a live batch quote from Yahoo Finance every 60 seconds and displays the results in a high-contrast neon trading-terminal interface. No API key. No account. No setup.

⏱️ TRANSPARENT UPDATE CYCLE:
Unlike static tickers that update silently, NYSE Top 50 Trades makes every refresh fully visible:
• 🔵 A progress bar fills left-to-right over 60 seconds — you always know where you are in the cycle.
• 🟡 The bar turns gold and pulses during the active fetch.
• 🟢 A status dot breathes green when data is live, flashes gold while fetching, turns red on error.
• A live countdown ("Next update: 42s") tells you exactly when the next prices arrive.

📊 WHAT YOU SEE PER STOCK:
• Ticker symbol and full company name.
• Last price in USD — glows green ▲ if up, red ▽ if down from previous close.
• Percentage change with directional arrow.
• Trading volume formatted as K / M / B.
• Colour-coded sector strip on every row (gold = Finance, orange = Energy, cyan = Tech, and more).

🗂️ SORT AND FILTER:
• Click any of the 6 column headers (Symbol, Company, Price, CHG%, Volume) to sort ascending or descending — active column glows gold with a directional arrow.
• 8 sector filter buttons (Finance, Energy, Tech, Consumer, Health, Industry, Telecom, Travel) let you instantly narrow the list — perfect for Fed days, earnings season, or oil price moves.
• A thick, permanently-visible scrollbar keeps all 50 rows accessible at any time.

🏛️ THE 50 STOCKS:
A curated roster of 50 high-volume NYSE-listed names spanning 8 sectors:
💛 Finance: BAC, WFC, C, JPM, GS, MS, USB, AIG, MET.
🟠 Energy: XOM, CVX, OXY, SLB, HAL, COP, MRO, DVN.
🔵 Tech: IBM, MU, PLTR, HPE, ORCL, AMAT, GLW.
🩷 Consumer: F, GM, KO, PG, WMT, MCD, NKE, CCL, LVS.
🟢 Health: PFE, JNJ, MRK, BMY, ABT, UNH.
🟣 Industry: GE, BA, RTX, LMT, CAT, MMM.
🟡 Telecom: T, VZ, CMCSA.
🩵 Travel: AAL, DAL, NIO.

The list is fixed and curated — not dynamically reshuffled — ensuring reliable, uninterrupted operation all trading day with no API keys required.

🔒 SECURITY-FIRST ARCHITECTURE:
✅ No data collection — explicitly declared in manifest.json via data_collection_permissions: ["none"] .
✅ No telemetry — no analytics, no tracking, no external pings beyond Yahoo Finance.
✅ No eval() — safe, audited code meeting Firefox extension standards.
✅ No innerHTML — all DOM built with createElement and textContent.
✅ Input validation on every API response field before it touches the UI.
✅ Minimal permissions — only the two Yahoo Finance host URLs required.
✅ Content Security Policy locked to script-src 'self'.

🎯 PERFECT FOR:
• Investors and traders who want a persistent market panel while working in the browser.
• Finance professionals monitoring sector moves during trading hours.
• Developers and privacy-conscious users who want a zero-tracking, zero-account market tool.
• Anyone curious about how the NYSE's most-traded names are moving right now.

⚙️ TECHNICAL:
• Firefox 140.0+ desktop only · Manifest v2.
• 60-second refresh · ~390 API calls per trading day (within Yahoo Finance free limits).
• Three-tier fetch fallback: batch primary → batch fallback → 50× per-symbol.
• No storage • No background scripts • No account required.
• Runtime Execution RAM Footprint: ~43 KB (core scripts: manifest.json + sidebar.html + styles.css + ticker.js).
• Total Extension Download/Install Size: ~ 102 KB (including README.md).

🔒 SECURITY-FIRST ARCHITECTURE:
100% Client-Side • No Data Collection • No Tracking. • No Account.

📈 NYSE Top 50 Trades: The New York Stock Exchange in your sidebar. Sort it. Filter it. Watch it move.