I See Dead Tabs от SingeQuantique

I See Dead Tabs auto-sleeps or closes inactive tabs to free memory and clear the clutter. Fast to set up, privacy-respecting, and 100% open source—so Firefox stays smooth without breaking your habits.

• Choose inactivity rules (duration + action: sleep/close)
• Respects pinned tabs and your critical sites (exceptions list)
• One-click pause when you don’t want automation
• Option to ignore tabs playing audio/video
• Clear notifications for what’s slept/closed
• No data leaves your browser — zero tracking

Why you’ll love it
- Faster, lighter Firefox during heavy multitasking
- Less tab overload → more focus
- Transparent by design: open source, predictable behavior

Install it, set your idle time, and let the extension keep your workspace clean—so you can stay in flow.