New Playbook: Cold Email Infrastructure Setup Guide

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Coming Q4 2026 • Free Forever Tier

Email Finder Chrome Extension

Find verified business emails from LinkedIn, Sales Navigator, or any company website. Without leaving the tab you are already on.

Join the waitlist

Be first in line when the extension ships. Get early access plus 500 bonus credits.

No spam. We will only email you when the extension is ready.

linkedin.com/in/jane-smith
forward_to_inbox Mailsfinder

Jane Smith

Head of Growth at Acme Corp

A profile page on LinkedIn or Sales Navigator. No email visible, no Contact Info button.

Mailsfinder Popup

check_circle Email found

jane.smith@acmecorp.com

Verified • SMTP Deliverable

Preview · Not the final UI

What the extension will do

person_search

LinkedIn profile to email

Open any LinkedIn or Sales Navigator profile. Click the Mailsfinder icon. Get the verified business email in under a second.

domain

Company website lookup

Visit any company site, the extension detects the domain. One click shows the email pattern, sample employees, and CEO email.

checklist

Bulk export from search results

Run a Sales Nav or LinkedIn People search. Hit Export. Get a CSV of verified emails for every person in the result set.

verified

Real-time SMTP verify

Every email returned from the extension is SMTP-verified at the moment of lookup. No guessing. No bounces.

sync

CRM sync (HubSpot, Salesforce)

Push found contacts into your CRM with one click. No copy-paste. No tab switching.

savings

Free tier, no credit card

100 free credits per day, forever, just like the rest of our tooling. The same Mailsfinder backend that powers our API and web app.

Use Mailsfinder today without the extension

The Chrome extension is the new front door. The backend that powers it has been live and battle-tested for thousands of customers. If you do not want to wait, use these instead:

Tool

Free Email Finder

Paste a name and a domain. Get a verified email back in under a second. Works in any browser.

 Tool

Free Email Verifier

Paste any business email. Get a real-time SMTP verdict in under a second. 15 free per day.

 Tool

Email Pattern Detector

Paste a company domain. Get the email format the company uses with sample addresses.

 Tool

Email Permutator

Paste a name and domain. Get all 24 common email format combinations instantly.

Why we did not ship this on day one

We chose to ship the API and the web app first because they cover the most-used workflows: bulk find, bulk verify, automation via n8n and Make. A Chrome extension is a different product surface. It needs to handle LinkedIn DOM scraping rules, Sales Navigator iframe quirks, CRM auth flows, and Chrome Web Store review timelines.

We are building it now, the right way. We will ship it when it actually works end to end without breaking on the next LinkedIn UI refresh.

If you want to use the existing backend via API in the meantime, the REST API handles everything the extension will eventually do. Most SDR teams plug it into their existing sequencer (Smartlead, Instantly) via webhook today.

FAQ

When will the Chrome extension ship? expand_more
Target is Q4 2026. Beta testers from the waitlist will get access 2-3 weeks before public launch. We will email you the moment beta opens.
Will the extension be free? expand_more
Yes. Same free tier as the web tools: 100 free credits per day, no credit card. Paid plans for bulk usage (Monthly $9.99 for 300,000 credits, Annual $7.99 per month billed annually, Lifetime $249 once for 2 million credits).
Will it work on Sales Navigator? expand_more
Yes. Sales Navigator support is in the core spec along with regular LinkedIn profiles, search results pages, company employee lists, and any company website.
What about my LinkedIn account safety? expand_more
The extension never scrapes LinkedIn data at scale. It only reads what is already on the page you are looking at, the same way you would copy-paste a name. No automation, no bulk scraping, no account risk.
Is there a Firefox or Edge version? expand_more
Chrome ships first. Edge will follow within 30 days since it uses the same Chromium extension format. Firefox port is planned for Q1 2027 if there is demand.
What can I do in the meantime? expand_more
Use the free Email Finder or Pattern Detector in any browser. Or read our listicle of the best email finder Chrome extensions shipping today and switch to Mailsfinder when our extension lands.

Related reading

Listicle

Best email finder Chrome extensions

Every extension worth installing today, ranked by accuracy, pricing, and Sales Nav coverage.

 Listicle

Best email finders for LinkedIn prospecting

10 tools tested for LinkedIn-first outbound. Compare each on profile-to-email accuracy and bulk export.

 How-to

How to find emails on LinkedIn

5 methods that actually work in 2026, with or without an extension.

 Solution

Mailsfinder for LinkedIn prospecting

How SDRs use Mailsfinder today to find verified emails from LinkedIn profiles at scale.

Get early access

Join the waitlist for the Mailsfinder Chrome extension. Beta testers get 500 bonus credits and access 2-3 weeks before public launch.