5 Chrome extensions quietly printing money from data nobody wanted to extract

This week's niche: the browser as an information extraction layer. Every extension this week does the same structural thing — it sits between a webpage the user already has open and a more useful form of the data on it. A video transcript. A job posting's credibility signal. A tab list turned vertical sidebar. A fixture schedule in local time. A website's design assets in a ZIP. None of them require a server to stay alive, and at least two of the five have developer-confirmed paying users despite install counts most engineers would call embarrassing. That's the point.

Adjacent niches still uncrowded: email thread summarizers that work inside Gmail (not a standalone app), stock-watchlist overlays on financial news sites, recipe-to-shopping-list converters that work on any cooking blog, and court-docket scrapers for legal professionals browsing PACER (the US federal court records portal) or CourtListener (a public-access law database). All four follow the same extraction-layer pattern.

One methodology note upfront: install counts come from Chrome Web Store listing pages or developer self-disclosure, as specified per entry. MRR estimates use installs × paid conversion % × tier price — methodology written out per entry, not concealed in a footnote.

The five extensions

1. YouTube to Transcript — 20K+ installs, $85 MRR (developer-disclosed)

Install count: 20,000+ (CWS listing, confirmed). 1 30-day growth: not independently tracked; extension was last updated May 21, 2026 (version 1.2.1), 4.6/5 rating across 265 reviews.

What it changes in the browser: Adds a one-click transcript button directly on any YouTube video page — no tab-switching, no copy-pasting a URL into a separate tool — and optionally translates it into 89 languages before export.

Monetization model: Freemium. Free tier covers basic transcript copy. Pro unlocks SRT/VTT subtitle export, multi-speaker identification, and cross-device sync for saved transcripts. Developer is Vitaly Prius (Prius Lab, Ukraine), solo. 1

Estimated MRR: $85/month — developer-disclosed on Reddit in March 2026. 2 At 20K installs, that implies roughly 0.04% paid conversion at ~$10/month Pro — unusually low, which the developer's framing supports: he treats this as a companion to YouTube to NotebookLM (400K+ installs), not as the main revenue vehicle. Any conversion improvement on a 20K base moves the number quickly.

Why Chrome specifically: YouTube's video page DOM exposes the transcript component only while the page is active and authenticated. The extension reads that DOM element in-page — no API key required, no server roundtrip. A web app on a different origin can't touch another site's authenticated session.

Reproduction signal: The transcript layer works on any video platform that exposes a caption track — Vimeo, Loom, Wistia, LinkedIn Learning — each a separate one-week build on the same core. The 89-language translation feature unlocks non-English markets that, as last week's Web Clipper for NotebookLM data showed, can grow without English-language marketing.

2. Uncluttr — 3,000 users, ~200% growth in weeks, freemium $4.16/mo

Install count: 3,000+ (developer-disclosed, Reddit, June 8, 2026). 3 The developer, Ciprian Nair (Nair Development Hub SRL, Romania), logged into his analytics to push version 1.1.6 and discovered the count had moved from 1,000 to 3,000 — growth he'd missed entirely by stepping away from the dashboard for a few weeks. CWS listing confirms "Offers in-app purchases" flag. 4

What it changes in the browser: Replaces Chrome's horizontal tab bar with a vertical sidebar that AI-groups open tabs by context automatically. Detached tabs use zero RAM (one-click restore).

Monetization model: Freemium. Free tier: unlimited workspaces, duplicate detection, auto-close. Unlimited tier: $4.16/month ($49.99/year) for full AI auto-grouping, priority support, analytics, and rule-based grouping. Cross-device sync and smart group renaming are listed as "coming soon." 4 5

Estimated MRR: Unverifiable — no conversion rate disclosed. At 3,000 installs × 3% paid conversion × $4.16/mo: ~$375/mo (illustrative). The developer noted he'd "hoped for more paid revenue" before shifting focus; actual figure is likely below this estimate at this stage.

Why Chrome specifically: The vertical tab sidebar requires hooking into the chrome.sidePanel API and intercepting tab lifecycle events (chrome.tabs.onCreated, onRemoved, onUpdated) in real time. A web app cannot observe another window's tab state. The RAM-saving comes from chrome.tabs.discard() — a privileged extension API only.

Reproduction signal: Ciprian's stated shift to building features and talking to users, rather than watching the dashboard, led to 3× growth he didn't notice. 3 In the same Reddit thread, the developer of TabiTabs (10 CWS users, also freemium) wrote he was "struggling to find first users" while congratulating Uncluttr. 6 The niche is not crowded.

コンテンツカードを読み込んでいます…

3. GhostJob — 23 MAU, $0 MRR, but a defensible ghost-job scoring niche

Install count: 23 MAU (developer-disclosed, Indie Hackers, May 20, 2026). 7 CWS ID: mdjchaohgneaiflafheajamfomeccach, last updated June 8, 2026 (version 1.0.8). 8

What it changes in the browser: Overlays a 0–100 "Ghost Score" badge directly on job listings in Indeed, LinkedIn Jobs, and Glassdoor — scoring each posting for signs it's fake or unfillable before the user applies.

Monetization model: Freemium with a lifetime option. Free: 10 scans/day, Ghost Score, signal breakdown. Pro: $6/month or $59 lifetime, unlimited checks, company-level Ghost Rate (how often that employer posts unfillable jobs), CSV export. 7 Developer is Shota (shota.katougi), Japan, solo. 8

Estimated MRR: $0 (developer-confirmed). Six-month target: $350 (50 paying users × $7/month average). 7 The closest visible competitor is HideJobs (roughly 3K CWS users, $4.99/month) — suggesting the ceiling exists. The primary bottleneck Shota identified: the UI is Japanese-only. "The single largest reason I'm at 23 MAU," he wrote — an English release is the highest-leverage item on the roadmap. 7

Why Chrome specifically: The extension reads the job listing DOM while the user is browsing — it injects a badge in real time without a server round-trip. A standalone web app would require users to paste URLs manually; the product only works at browse-time. Ghost Score signals (days since posting, duplicate-posting count, description specificity) are all DOM-parseable — fully client-side, no data leaves the browser.

Reproduction signal: Shota shows the score rather than hiding the posting: "A 65/100 posting at a company you really want is still maybe worth applying to. You just want to know what you're walking into." 7 That's a better call than HideJobs's approach of just hiding listings. The adjacent clone: salary-disclosure compliance warnings on US job postings — same DOM overlay, different signal source, same buyer intent.

indiehackers.comhttps://www.indiehackers.com/post/building-ghostjob-a-chrome-extension-to-detect-ghost-job-postings-day-19-23-mau-0-mrr-b6083b2db2外部リンク

コンテンツカードを読み込んでいます…

4. World Cup 26 Fixtures — 4 CWS users, one-time purchase, deadline-driven launch

Install count: 4 (CWS, confirmed June 7, 2026). 9 The World Cup kicks off June 11 — four days from publication — so this count will look very different by next week. Developer: tomstan (AstroEdit Ltd, UK), solo, first Chrome extension. Reddit self-disclosure: June 7–8, r/chrome_extensions and r/SideProject. 10

What it changes in the browser: Adds a popup with all 104 World Cup matches in the user's local time zone, plus the specific TV channel for their country (22 countries covered, auto-detected), with zero network requests in the free tier — all fixture data is bundled in the extension. Pro unlocks live scores, goal notifications, and a discreet score ticker at the top of the browser window that can be closed tab-by-tab.

Monetization model: Freemium, one-time purchase for Pro. Payments via ExtensionPay and Stripe, no account required. 9 Pro price is not publicly listed (price wall at purchase stage); the developer's stated reason for choosing one-time over subscription: "Every fan, myself included, has the same two questions all tournament — 'what time are the matches here?' and 'what channel is it on?' — and nobody wants a subscription for that." 10

Estimated MRR: Unverifiable — Pro price not disclosed, install count is pre-tournament. Any projection here would be speculative; this entry is in the list for the event-companion pattern, not current revenue.

Why Chrome specifically: The offline-first free tier is only possible as an extension — all fixture data ships in the package, zero backend. The live score Pro tier calls ESPN's public scoreboard endpoint. A mobile app could do the same, but a browser popup covers "I'm at work and want discreet score updates" in a way a phone notification doesn't.

Reproduction signal: Ship the static-data layer free before an event; charge for real-time during it. The pattern holds for any scheduled broadcast event with confusing TV rights: Formula 1, Olympics, cricket, tennis majors. The free tier is a static JSON of fixtures in the extension manifest — one afternoon of data entry, no server, no infrastructure cost under a traffic spike. The live score tier needs an ESPN API call and chrome.notifications setup. Two-week build including ExtensionPay integration is realistic.

5. ZipIt — 234 CWS users, 10+ paying, website-to-ZIP developer tool

Install count: 234 (CWS listing, confirmed). 11 Developer: u/SnooJokes8035 (Bharat Modi, blintix.store), solo; self-disclosed 300+ active users and 10+ paying customers. CWS: 5.0 rating (14 reviews), version 1.5, updated May 17, 2026.

What it changes in the browser: Lets developers point the extension at any website and extract its fonts, color tokens, design assets, UI components, performance insights, and screenshots — packaged as a ZIP download. Also runs accessibility audits (WCAG) and SEO analysis in-page.

Monetization model: Three-tier. The Chrome extension itself is free. Paid access comes through: Zipit Web Pro ($12/month, unlimited exports in cloud), Desktop app ($69 one-time, local), and Ultimate Bundle ($149 one-time, Chrome extension lifetime + Desktop + 1 year Web Pro). 12 The extension is the distribution wedge into the paid ecosystem.

Estimated MRR: At 10 paying customers across tiers, assuming an average of $20/month (mix of $12/mo Web Pro and annualized one-time purchases): ~$200/month (floor estimate). The developer has listed ZipIt on Softonic, Huzzler, FoundrList, SaasHub, and at least six other directories. 13

Why Chrome specifically: Design asset extraction requires reading the page's computed styles, traversing the DOM for image URLs and font-face declarations, and running a layout-tree analysis — all of this only works from within a content script running in the page's origin context. No external scraper can compute what the browser has actually rendered, including dynamic content and lazy-loaded assets.

Reproduction signal: The direct adjacent niche: icon library harvesters that pull all SVG icons from any design system's docs page in one click. Same DOM traversal, narrower scope, higher buyer intent (designers already pay for Figma plugins). The multi-tier model — free extension as distribution wedge into paid cloud/desktop — is worth studying: the extension works standalone, but users who need batch processing or offline capability hit the paywall naturally.

ZipIt demo — website design asset extraction in the browser — ZipIt extracting design tokens from a website. 11

At a glance

Extension	Installs	Monetization	Est. MRR	Sprint-cloneable niche
YouTube to Transcript	20K+ 1	Freemium	$85/mo (dev-disclosed) 2	Transcript layer on Vimeo / Loom / LinkedIn Video
Uncluttr	3K 3	Freemium $4.16/mo	~$375/mo (illustrative)	Vertical tab sidebar with context memory
GhostJob	23 MAU 7	Freemium, $6/mo or $59 lifetime	$0 (pre-English-release)	Salary-disclosure compliance warnings
World Cup 26 Fixtures	4 9	One-time Pro (price undisclosed)	Not yet measurable	Event-companion pattern for any broadcast schedule
ZipIt	234 11	Free extension + paid cloud/desktop tiers	~$200/mo (floor estimate)	SVG icon library harvester for design system docs

MRR methodology: all figures use installs × paid conversion % × tier price. The $85 for YouTube to Transcript is the only developer-confirmed number in this batch. 2 All others are marked "illustrative" or "floor estimate" as noted.

One side signal worth noting

One extension turned up this week that couldn't be profiled: the developer intentionally withheld the name. Richard Smith (IndieHacker07333 on Indie Hackers) reported $1,200 MRR from a Chrome extension that rewrites LinkedIn posts in different tones — "no GPT-4 fine-tuning, no RAG pipelines" — at $9/$19/$49 per month, with 34% of paying users on the $19 tier. 14 The CWS ID is not findable. The $19 tier at 34% conversion is the sharpest pricing signal of the week. Smith's note: "Turns out the simplest AI use cases have the least competition." 14 He spent 11 months of evenings reaching that number.

Data collection window: June 2–9, 2026. Install counts from Chrome Web Store listing pages or developer self-disclosure, as noted per entry. MRR figures are estimates with stated methodology except where developer-confirmed. No fabricated data.