Lulltab

Forty tabs open.
Four in use.

Lulltab unloads the rest. They stay in your tab strip, give their memory back, and reload the moment you click them.

Download for Chrome View source on GitHub

Onboarding flow is open.

Idle tabs sleep after 15 minutes.

Memory held by tabs

2.1 GB

A pretend tab strip. Time runs 90 times faster here. Click a sleeping tab to wake it.

How a tab falls asleep

  1. You leave it

    The idle clock starts when you switch away from a tab — not when the page last changed.

  2. Your timer runs out

    After 15 minutes, or whatever you pick from 1 minute to 24 hours, Lulltab asks the browser to discard the tab. The page unloads. The tab, its title, and its icon stay put.

  3. You click it

    The browser reloads the page from its address, and the idle clock starts over.

While Lulltab is on, Chrome’s built-in Memory Saver can’t discard tabs on its own schedule. Only your timer decides.

What never sleeps

  • The tab you’re looking at
  • Pinned tabs
  • Tabs playing audio
  • Browser pages like chrome:// and aside://
  • Tabs an Aside agent is working in
  • Sites you keep

Keeping sites

You typeLulltab keeps
github.comgithub.com and every subdomain
=mail.google.comOnly that exact host
*.notion.soSubdomains, not notion.so itself
github.com/neelThat path and everything below it
https://mail.google.com/mailAny URL that starts with it
The Lulltab popup: the current tab with Sleep and Keep site buttons, a Rest after slider set to 15 minutes, and a list of open and sleeping tabs.

One click from the toolbar

Sleep
Unload the current tab now.
Keep site
Never sleep this site again.
Rest after
Set the idle timeout.
Sleep the rest
Unload every tab except this one.
Memory
See how much RAM each open tab is using, largest first.
Alt Shift S
Sleep the current tab from the keyboard. Right-click any page for the same options.

Nothing leaves your browser

Lulltab makes no network requests. There’s no server, no analytics, and no account. Settings stay in chrome.storage.local. Here is what each permission is for.

tabsSee your tabs and discard idle ones.
alarmsCheck the idle timer once a minute.
storageSave your timeout and kept sites on this device.
contextMenusAdd Sleep this tab and Never sleep this site to the right-click menu.
tabGroupsLeave tabs in an Aside agent’s group alone.
processes, system.memoryMeasure memory per tab for the Memory view.
scripting, all sitesRead a page’s memory use when the browser doesn’t report it per process. Nothing else is read.

Install in a minute

Lulltab isn’t on the Chrome Web Store yet, so you load it yourself. It works in Chrome, Aside, Brave, Edge, and other Chromium browsers from version 116.

  1. Download lulltab.zip and unzip it.
  2. Open chrome://extensions (or aside://extensions) and turn on Developer mode.
  3. Click Load unpacked and pick the unzipped lulltab folder.
  4. Pin Lulltab to the toolbar. Tabs start sleeping after 15 minutes.

Prefer the source? git clone https://github.com/neelsatyavolu/lulltab and load the folder as-is. There’s no build step.