Video research · June 20, 2026
7 Chrome extensions making
$411K+ a month. Each one is broken.
Real revenue. Real complaints. Each one fixable in a single PlugThis prompt — and the fix is the opportunity. Here's the data, the verbatim 1-star reviews, and the exact PlugThis prompt for each one.
Verified from Chrome Web Store
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Methodology transparent
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Sources cited per claim
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How we estimate revenue. Chrome Web Store does not publish revenue. Every estimate uses the same transparent formula: public user count × industry-standard conversion rate × public pricing. Every bad review is quoted verbatim with the review date and helpfulness count. Every claim citable from a public source linked at the bottom of each section.
The 7 extensions
Click any card to jump to its full breakdown — revenue formula, verbatim reviews, the exact PlugThis prompt.
The breakdowns
Each section has the public revenue formula, verbatim negative reviews, the exact PlugThis prompt to build the fix, and follow-up chat prompts to refine.
What it does
Downloads images in bulk from web galleries and social media. The Chrome extension is the trigger; it requires installing a separate paid Windows desktop application to actually run.
Estimated revenue
60,000 users × 30% historic conversion × $39.95 ÷ 24mo amortization
≈ $30,000 / mo
Real monthly revenue likely $15-50K depending on new buyer flow. Antibody Software is registered as an EU trader on Chrome Web Store.
What users actually say (verbatim)
★ · Apr 12, 2018 · 6 of 21 found helpful
"This is a joke, I have extension that download files. You have to add more software from their site, which costs money. I was just checking this out. I would not recommend it."
★ · Jan 31, 2018
"Ask to install another expensive software to work"
★ · Jan 3, 2018 · 3 of 6 found helpful
"Doesn't even detect all the images in the FB post. Amateur work. Useless to me."
★ · Dec 9, 2018 · 2 of 2 found helpful
"MY PC HAS BEEN HANGING EVER SINCE I 'BOUGHT' THIS. THE PROGRAM NEVER RESPONDS AFTER I BOUGHT AND REGISTERED THE CODE AND EATS UP ALL THE MEMORY ULTIMATELY CRASHING THE PC. I HAVE EMAILED THEM A DOZEN TIMES AND NO RESPONSE."
The PlugThis prompt to build the fix
Build a Chrome extension that downloads all images from any webpage in one click. Browser-only, no desktop app required. Detects images from Facebook posts, Instagram, Pinterest, and general web pages. Lets me pick image size minimum (e.g., skip thumbnails). Saves to a single folder I choose, named after the page title. Shows progress while downloading.
Chat refinements (each one fixes a complaint above)
↑ Back to all extensions
What it does
Point-and-click web scraper that extracts data from websites and exports to CSV/XLSX. Browser extension is free for local use; the cloud platform — Project $50/mo, Professional $100/mo, Scale $200+/mo — runs scheduled scrapes with proxies and parallel jobs. The free-to-paid funnel runs through the extension.
Estimated revenue
900,000 ext users × 0.5% cloud conversion × $80/mo avg tier
≈ $36,000 / mo
Conservative. Real number likely $50-150K — cloud bandwidth overages alone drive significant ARPU on the Scale tier. The extension is the top-of-funnel for the SaaS.
What users actually say (verbatim)
★★★ · Jun 7, 2026 · Estudio Romero Vidal
"It's not very intuitive, it doesn't have simple, easy-to-use functions; if I want to download all the PDFs from a page, it's a hassle."
★ · Firefox 1-star
"User interface is completely different from what advertised in the videos."
★ · Firefox 1-star
"export option not working… it is working but erratically, sometimes exporting quickly sometimes exporting after hours. sometimes not at all no matter how many times i press the export button."
★★ · Mar 20, 2020 · zzzzzd · Firefox
"powerful tool. But I uninstalled it as my antivirus detected it as a potential threat. I would recommend NOT to install it. It says that 'This is not a Recommended Extension' for a good reason."
The PlugThis prompt to build the fix
Build a Chrome extension that scrapes data from any webpage. Click any element on the page to select it; the extension figures out the CSS selector. Click a similar element to add it to the list. Click "Run" and it walks every matching row on the page and exports a CSV. Sidebar UI matches the marketing video exactly: three buttons (Select, Run, Export). No cloud, no account, no overage charges. Saves the recipe locally so I can re-run on the same site later.
Chat refinements (each one fixes a complaint above)
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What it does
PDF editor that runs in Chrome. Free tier lets you annotate 3 documents per month. Paid tiers ($9 Starter, $19 Pro, $99 Business) unlock unlimited editing, signing, sharing, and team collaboration.
Estimated revenue
100,000 extension users × 3% premium conversion × $19/mo avg
≈ $57,000 / mo
Likely higher — Lumin's web app reaches well beyond extension users. Customer logos publicly shown: Costco, Spotify, Salesforce, Pinterest, PayPal, Uber.
What users actually say (Trustpilot, Capterra)
★ · Trustpilot review
"After a year, the service locked me out of my file labeling it 'expired' and stated I need to pay for an account ($30/month!) to access the file. Incredibly predatory behavior by Lumin, essentially holding peoples' data hostage."
★ · Capterra review
"At times Lumin PDF could be a bit slow-loading, and page arranging is slow to respond."
★ · Trustpilot review
"Syncing issues between Lumin PDF and cloud storage services, where changes made in Lumin PDF do not immediately reflect in the cloud storage. Merging PDFs is clunky and converting PDFs is inaccurate."
The PlugThis prompt to build the fix
Build a Chrome extension that opens any PDF in the browser, lets me annotate (highlight, comment, draw arrows), and save the annotated version locally. No account required. No file locking. Stores all data on the user's machine, not on a server. Adds a "merge two PDFs" feature in the popup. Note: this is the heaviest of the 7 builds — uses bundled PDF.js + PDF-lib. Expect 3-4 chat refinements to polish.
Chat refinements (each one fixes a complaint above)
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What it does
Creates and deploys HTML email signatures across email clients. Extension installs signatures into Gmail, Outlook, etc. Founded 2013, claims 200K+ customers, 30M+ hours saved, 4.8★ on Trustpilot for the web app.
Estimated revenue
200,000 customers × 10% active paid × $99/yr ÷ 12 months
≈ $165,000 / mo
Conservative. Likely higher given enterprise tier ($2/user/mo on Conquer plan) plus 12 years of compounding ARR.
What users actually say (Trustpilot, G2)
★ · Trustpilot
"Repeated errors on the login interface, making it impossible to access the profile. A clear lack of responsiveness to rectify the situation."
★★ · G2
"It can be particular about the image size and dimensions, and doesn't clearly indicate previously used scales."
★ · Trustpilot
"This product didn't work for our clients."
The PlugThis prompt to build the fix
Build a Chrome extension that creates HTML email signatures. Let me design with name, title, company, contact info, and social icons. Auto-installs into Gmail compose window. No account required. Validates image dimensions before insert and warns if they'll break in Outlook. Exports the signature as a copy-paste HTML block for other clients.
Chat refinements (each one fixes a complaint above)
↑ Back to all extensions
Why this one is interesting
This extension is FREE — no monetization. 60,000 users actively use it, and they hate it. Nobody has built the paid version yet. This is the rarest opportunity in the deck: real demand, real pain, zero direct competitor charging for the fix.
Estimated revenue OPPORTUNITY
60,000 frustrated users × 5% switch to paid × $5/mo
≈ $15,000 / mo MRR potential
No competitor charging for a "fix" version yet. Bookmarks are a real workflow tool. People will pay for a clean version.
What users actually say
★ · Dec 9, 2023 · 15 of 16 found helpful
"With even a little more effort you could have made the 'New' Bookmark Manager even more complicated and confusing. WHERE ARE THE BOOKMARKS in the 'New' Bookmark Manager??? Don't need all the instructions, just show the bookmarks and make the UI intuitive and simple."
★ · Aug 7, 2023 · 12 of 14 found helpful
"The Overview here has a screenshot of a Search screen. In reality I can't find it. I can't search my bookmarks anymore. I used to be able to manage them in seconds. Why did Chrome take something that worked perfectly and break it??"
★ · Jul 15, 2023 · 11 of 12 found helpful
"I used to go to the upper right corner of my screen, click the menu, see 'Bookmarks manager', and click that to find a specific website. That would take mere seconds. Can't do that now. I'm a home cook, and it's a total hassle to try to find a certain recipe."
The PlugThis prompt to build the fix
Build a Chrome extension that opens a clean bookmark manager in a new tab. Big search bar at the top that filters bookmarks by title or URL as I type. List view with the 10 most recently used bookmarks at the top. Let me drag bookmarks into folders. Right-click any bookmark to edit, delete, or copy URL. No instructions, no setup screen — just show me my bookmarks.
Chat refinements (each one fixes a complaint above)
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What it does
Summarizes articles and PDFs using GPT models. Tailored for analysts, strategists, policymakers, business developers. Freemium with paid tiers starting at $7/mo.
Estimated revenue
10,000 users × 5% premium conversion × $7/mo
≈ $3,500 / mo
Smaller scale but growing fast. Trending AI category. Real example of "good rating overall, specific fixable complaints."
What users actually say
★ · Dec 15, 2024
"I'd rate it at a HALF STAR or ZERO OF FIVE STARS if possible, it is totally false advertising! It advertises a 'Free tier'. Ridiculously and incredibly ERRONEOUSLY INACCURATE! I'd say it could be 'possibly considered' a VERY LIMITED 'Free Trial' if anything."
★ · Mar 25, 2025
"Why does it show 'Error 400: redirect_uri_mismatch' when I sign in using my Google account?"
★★★ · May 5, 2023 · 6 of 7 found helpful
"It is asking for payment from today 5th of May... Is it no more free?"
The PlugThis prompt to build the fix
Build a Chrome extension that summarizes any article or PDF I'm reading. Pop-up button in the corner; click to get a 3-bullet summary. Uses MY OpenAI key (BYOK) so there's no quota issue and no surprise paywall. Stores all summaries locally so I can search them later. Lets me copy the summary or share as link.
Chat refinements (each one fixes a complaint above)
↑ Back to all extensions
What it does
Blocks websites and apps to fight distractions. Free tier limits you to a handful of sites (~3-6). Premium ($7/mo) unlocks unlimited blocking, password-lock, scheduled blocks, and category blocking. Parent company Big Star Labs was caught running a spyware campaign in 2018; extensions were pulled by Chrome and Firefox, then reinstated.
Estimated revenue
1,000,000 users × 1.5% premium conversion × $7/mo
≈ $105,000 / mo
Conservative. Free tier becomes unusable past 6 sites, forcing aggressive upgrade prompts. Real conversion likely 2-4%, putting revenue closer to $140-280K/mo.
What users actually say (verbatim)
★ · Jun 20, 2026 · Krishan Hegde
"steal ur data"
★★ · Jun 17, 2026 · Arman Ossi Loko · 2 of 2 found helpful
"Asks you to 'opt in' so they can spy on you. If you say 'maybe later', the extension doesn't work then. lol As shady as it gets. Used to be a good extension about 10 years ago, though."
★ · Jun 17, 2021 · Firefox
"This one of the spammiest addon ever; the author probably looked up every dark pattern on the web and decided too add all of them."
★ · Jun 29, 2021 · Firefox
"you have to pay to block more than 6 sites. Just ask for donations like everyone else"
★ · Dec 31, 2021 · Firefox
"This add-on is no good because as soon as it blocks a page, a window opens automatically and asks you to upgrade to the premium version."
The PlugThis prompt to build the fix
Build a Chrome extension that blocks distracting websites. Unlimited block list — no 6-site limit, ever. Block by full domain, subdomain, or URL pattern. A "Focus Mode" timer: I set 25 / 50 / 90 minute focus sessions and the settings page is locked behind a passphrase I set on first launch — so I can't toggle off the block list mid-session in a moment of weakness. All data lives in chrome.storage on my machine — no account, no opt-in, no analytics, no telemetry. Clean dark-themed block page with a single line ("This is blocked until 3:42 PM.") — no upgrade prompts, no ads, no popups.
Chat refinements (each one fixes a complaint above)
↑ Back to all extensions
Three patterns that show up in every winner
The same playbook repeats across all 7 extensions. Learn the pattern, apply to your own pick.
01 · Find the rating gap
Chrome extensions where the rating is 3.5★ or lower
Below 4.0★ means people are actively unhappy. Below 3.5★ means the gap between what people paid for and what they got is wide enough that a "fix" version converts. That is the rating range to hunt in.
02 · Fix the specific, not the general
The complaint in the review is the prompt for the fix
"This downloader makes 50 folders for 1 image" is a fixable complaint. "I want a better image downloader" is not. Build for the exact pain in the exact review. Paste their complaint, fix that one thing.
03 · The submission was always the hard part
Most of the work was never the code
Writing the Chrome Web Store listing, generating store screenshots, writing permission justifications — that's what kills 9 out of 10 builders. PlugThis writes all of that for you. The thing that used to take 4 hours is gone.
| # | Extension | Users | Rating | Model | Est. monthly |
|---|
| 1 | Bulk Image Downloader | 60K | 3.5★ | $39.95 paid | $30,000 |
| 2 | Web Scraper | 900K | 4.1★ | Free + $50-300/mo cloud | $36,000 |
| 3 | Lumin PDF | 100K | 3.6★ | $9-99/mo | $57,000 |
| 4 | Email Signature Rescue | 200K total | 4.1★ | $99-499/yr | $165,000 |
| 5 | Bookmark Manager | 60K | 3.4★ | Free (opportunity) | $15,000* |
| 6 | Casper AI | 10K | 4.4★ | $7+/mo | $3,500 |
| 7 | BlockSite | 1M+ | 3.7★ | $7/mo Pro | $105,000 |
| Combined estimated monthly revenue | $411,500/mo |