SpeedSentry: Website Performance Monitor автор ABC8

Measures and displays page load times
Shows DOM Interactive and DOM Content Loaded times
Counts the number of resources loaded
Displays memory usage (if available)
Color-coded badge indicating performance (green, yellow, red)
Customizable performance thresholds
Option to choose which metric to display on the badge
Notifications for slow-loading pages (optional)
Refresh button to update performance data
Options page for easy customization
Persistent settings across browser sessions