Glimpse for Firefox от Vincent Brysse

Glimpse opens link previews in a real popup window, keeping you on your current page while you peek at the destination. Perfect for researching while reading, comparing multiple sources side by side, or checking links before fully committing to them.

Features:
- Configure which modifier key (Alt, Ctrl, or Shift) triggers previews
- Keyboard shortcuts for common actions: Ctrl+D to bookmark, Ctrl+Shift+L to copy the link, Ctrl+Shift+Enter to expand into a full tab, Alt+←/→ to navigate, Esc to close
- Resizable popup window that remembers its position between uses
- Works on any http/https link across all websites