[FEEDBACK] Built a Multi-Account Gmail Outreach Extension (Sending via active tabs) – Free copies for best insights

Hey guys,

I’ve been working on a browser extension designed for mass email campaigns and cold outreach directly through open Gmail browser tabs.

Instead of messing with complex API setups or burning domain reputation on fresh SMTPs, it hooks into your active logged-in browser tabs to keep sending patterns look completely organic.

Here is a preview of the dashboard:





What it currently does:

• Auto-Detects Open Tabs: Automatically scans and syncs every logged-in Gmail account open in your browser.
• Multi-Account Controls: Global controls to Pause All, Resume All, or Stop All active threads, or trigger individual campaigns per account.
• Live Activity Stream: Real-time logging displaying send times, sender account, target recipient, and immediate status.
• Unified Stats: Tracks sent volume, active campaign counts, and overall success rates across all connected accounts.

I need your raw feedback:

1. The 3K/Day Question: If you had the capacity to drop 3,000 cold emails daily directly through logged-in Gmail sessions, what’s your exact strategy? How are you warming up accounts, structuring sending delays, or managing residential proxies per tab to stay under the radar?
2. What essential features are missing here to scale this safely? (Spintax, custom delay ranges, auto-reply detection, auto-unsubscribe header insertion?)

I’ll give a FREE lifetime copy of the full script to the person who leaves the most valuable / interesting comment or breakdown on how they'd scale this.

It look like a good project is it for selling?