Ad-blockers often mistake tracking pixels for malicious trackers. Whitelist mailtrack.io in your ad-blocker settings. Step 3: Desktop Email Clients (The "Bridge" Fix)
Go to chrome://extensions/ , turn on "Developer Mode," and click the "Update" button. This forces Chrome to download the latest version of Mailtrack. If that fails, remove the extension completely and reinstall it from the Web Store. mailtrack for yahoo fixed