Send Selection to Gmail per Juliano

This extension adds a context-menu action that lets you send any selected text to Gmail quickly.

How it works:
1. Select text on any page (e.g., ChatGPT output).
2. Right-click → “Send selection to Gmail”.
3. A Gmail compose window opens with:
> The selected text prefilled as the email body
> An optional prefilled To address (if configured)
> A configurable Subject

Options:
- Set a default destination email (optional)
- Set a default subject
- Enable/disable auto-opening the Options page when the destination email is not configured

Privacy:
This extension does not send data to any third-party service. User settings (destination email, subject, toggle) are stored in Firefox extension storage only.