How to Install and Use Tomba’s Thunderbird Extension
Installation Steps
Click here to access the Tomba Thunderbird Extension page.
Click the “+ Add to Thunderbird” button.
Confirm by clicking “Add Extension.”
Once installed, the Tomba icon will appear in the top-right corner of your browser, next to the address bar.
Find Email Addresses from Any Website
With the extension installed:
Visit any company website.
Click the Tomba icon in your browser.
Tomba will return all known email addresses using the domain (e.g.,
@company.com) along with the URLs where they were found.
Additional Company & Contact Information
When available, Tomba also shows:
Domain Information: Website name, logo, URL
Company Details: Industry, city, postal code, phone number, revenue, employee count, social media links
Contact Details: Email, full name, job title, phone number, LinkedIn, Twitter, country
Note: The extension does not scrape emails from the webpage you’re viewing. It pulls emails from Tomba’s indexed database based on the domain.
Verifying an Email Address
Click the checkmark icon next to any email in the Domain Search to verify its validity.
Get Cell Phone Numbers
After a Domain Search, simply click the phone icon next to a contact to retrieve phone details (if available).
Find a Specific Person's Email
Tomba will generate the most likely email pattern based on the name and domain.
Example: {first}.{last}@domain.com
Save Leads from the Extension
Click the “+” icon next to any contact to save it to your Leads list in Tomba.
Filter Emails by Department
Use the Department Filter in the extension to narrow results to specific roles such as marketing, HR, IT, etc.
Account Overview
When logged in, you can view:
Your email and full name
Profile picture
Plan name and request usage
Account settings link
Upgrade link (if on a free plan)
Connection Settings
You can connect in two ways:
Via API Key & Secret Key (manual setup)
Auto Connection: Just open the extension from the search or welcome page
Extract Emails from Visited Pages
Tomba can passively collect leads as you browse:
Detect emails on visited domains
Show if the email already exists in your leads
Save with metadata (source, first seen, last seen)
Prevent duplicates
Delete any saved email from the table
Whitelist Domains
Add trusted domains to your Whitelist.
Domains on the whitelist bypass Tomba’s internal filters and are always processed.
Extension Settings (Parameters)
Customize how the extension works:
✅ Show number of emails in the icon
🖼️ Display images next to emails
🔔 Show notifications when emails are found
🧭 Auto-scroll to the email section
🔌 Enable Auto Connection to Tomba
🧹 Scrap email addresses on page
🔄 Restore defaults
🧼 Clear cache
⌨️ Activate with keyboard shortcut
Alt + T
Manage shortcuts directly from Thunderbird extension settings.
Troubleshooting: Domain Blocked Warning
If you see:
“Domain Blocked. The domain tomba.io is whitelisted, but blocked by you.”
→ Go to Tomba Settings → remove and re-add tomba.io from the whitelist.
About the Extension
See the extension version, release date, and helpful links in the About section inside the extension.
Still Have Questions?
We’re here to help!
If you have any questions or issues, contact our support team we’ll be happy to assist you.