Firefox + Chrome · v12.3.2

Marketplace margin overlay

Browse Etsy, Amazon, eBay, Poshmark, Depop, or Mercari listings — see what you keep after fees, using your COGS. Watchlist sync when you visit ProfitLens first.

Install on Firefox Chrome: download .zip Get Pro — unlimited overlays

Install (2 min)

Firefox: Add to Firefox on Mozilla Add-ons — one click.

Chrome (sideload until Web Store):

  1. Download profitlens-overlay.zip and unzip.
  2. Chrome → chrome://extensions → turn on Developer mode.
  3. Click Load unpacked → select the unzipped folder.
  4. Open any Etsy, Amazon, eBay, Poshmark, Depop, or Mercari listing — overlay appears bottom-right.
  5. Visit ProfitLens once to sync watchlist + Pro license.

Free vs Pro

FeatureFreePro
Etsy · Amazon · eBay · Poshmark · Depop · Mercari overlay5/day totalUnlimited
Watchlist COGS auto-fill✓✓
Default COGS in popup✓✓
Full calculator + alertsFree tier✓

Privacy

Extension reads listing prices on pages you open — no store connect, no browsing history sent to servers. Privacy policy