How it works
Select, click, compare by size
1
Select net worth text on a webpage.
2
Click the Marketcaper icon or right-click lookup action.
3
Open latest available billionaire net worth estimate. and compare links.
Net worth extension
Billionaire net worth browser extension
Select a billionaire name while reading and open a Marketcaper card with latest available net worth context and comparison links.
Examples to select
Elon MuskJeff BezosLarry EllisonWarren BuffettMark Zuckerberg
Billionaire net worth
Person-name focused lookup
Fortune-size comparison links
Cross-market compare tool access
Lookup card
Marketcaper Billionaires Net Worth Lookup
M
billionaire net worth catalogue
Elon Musk
Latest available billionaire net worth estimate.
Compare by sizeOpen asset
What it does
One clear lookup purpose
The Net Worth extension recognizes billionaire names and opens a focused card for fortune-size context, not stock, ETF, crypto, fiat, or GDP results.
Selected text
Local first, click to send
Selected text is inspected locally for a possible billionaire net worth catalogue match. It is sent to Marketcaper only after you click the icon or use the right-click lookup action.
Permissions
Only what the feature needs
Browser permissions support selection lookup, the context menu, saved preferences, and requests to Marketcaper. They are not used for ads or background page scraping.
Privacy
No account required
The extension does not require a Marketcaper account, does not sell selected text, and does not use selected text for advertising.
Review notes
Why the extension asks for browser permissions
Extension code is bundled in the browser package. Requests to Marketcaper return lookup data, not remote executable scripts.
Content script on webpages
Needed to place the small Marketcaper icon beside selected text. The extension filters selections locally and does not read whole pages.
Context menu
Adds the right-click Marketcaper lookup action for selected text when you prefer not to use the floating icon.
Storage
Remembers your enable or disable preference for selection detection on your browser.
Active tab and scripting
Supports the right-click fallback on the current tab when the content script needs to be loaded safely.
marketcaper.com access
Used only to request a category-scoped lookup after you click the icon or use the context-menu action.
FAQ
Questions before installing
Why is the URL net worth instead of billionaires?
The page targets the user intent: comparing net worth. The extension package still uses the billionaire catalogue internally.
Can a selected person be compared with Bitcoin or stocks?
Yes. Start from the net worth compare tool, then unlock all categories when you want cross-market comparisons.
Other catalogues