Abstract

A Chrome MV3 extension that watches Finviz top gainers and losers on a schedule, scores SHORT/BUY setups, and overlays CNN analyst forecasts — quantitative screening without leaving the browser.

Highlights

—Scheduled Finviz top gainers/losers scanning in Chrome MV3
—SHORT/BUY setup scoring with CNN analyst forecast overlays
—Browser-native quantitative screening — no separate dashboard required

JavaScriptChrome ExtensionFinvizQuantitative Finance

GitHub

README

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Finviz Stock Analyzer

Chrome MV3 extension that scans Finviz top gainers/losers on a schedule, scores SHORT/BUY setups, and surfaces CNN analyst forecasts.

Stack

Manifest V3 service worker + chrome.alarms (default: 30 min)
Data: Finviz screener/quotes, CNN production.dataviz.cnn.io, Yahoo Finance / Stooq OHLCV
Models: RSI, Bollinger, SMA, mean-reversion, Conv1D-style kernel ensemble, CNN analyst target scaling

Install

chrome://extensions → Developer mode → Load unpacked → this folder

Output per ticker

Field	Description
`recommendation`	`SHORT` / `BUY` / `HOLD`
`confidence`	0–99, signal agreement
`strongScore`	0–100 composite
`expectedShortGainPct` / `expectedLongGainPct`	Next-day projected move
`cnnAnalyst`	1y high/median/low targets
`exitTime`	Suggested cover window (ET)

Config (`chrome.storage`)

Key	Default
`scanIntervalMinutes`	30
`maxPages`	2 (20 tickers/page)
`batchSize`	3 parallel
`strongScoreThreshold`	60 (notifications)

Layout

manifest.json          MV3 entry
background.js          alarm + scan dispatch
popup.*                quick picks + sparklines
dashboard.*            tables, search, export, settings
lib/
  finviz.js              screener + quote scrape
  cnn.js                 analyst forecast API
  yahoo.js               OHLCV + fallbacks
  analysis.js            scoring engine
  scanner.js             batch orchestration
  shared-ui.js           formatters + canvas sparklines