TK Tree Style Tab Outliner icon

TK Tree Style Tab Outliner

Established publisherManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

TKTSTO is an outliner with tree-style tabs, bookmarks, and notes all in one

Users
178
+9 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
3
0 in 30 days
Store rank
#67K
#56K among extensions
Version
0.1.181.0
updated 10 Apr 2026

Users

monthly, 8 months
089178Feb 2026Jul 2026Oct 2026
Latest, 15 Oct 2026: 178 usersMove the mouse over the chart for any month

Ratings count

monthly, 8 months
023Feb 2026Jul 2026Oct 2026
Latest, 15 Oct 2026: 3 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About TK Tree Style Tab Outliner

Windows, tabs, bookmarks, notes, and more... all mixed together in one place, a highly structured living document that you and your browsers build together to organize your online life. TKTSTO is like Tabs Outliner or Tree Style Tab, but more powerful. Features: (there are a lot... maybe get a snack and drink before you dive in) - Nested vertical tabs and groups: Like the "vertical tabs" and "tab groups" function in some browsers, but way more powerful. Windows, tabs, bookmarks, and notes are all mixed together in one big outline or "tree" that you can organize however you want. Each item in the tree is a "node". - Handles many many tabs: Easily and reliably handles trees with tens of thousands of nodes. Whether you have 5 tabs or 50,000, this extension can handle it, even on old or slow computers. - Automatic backups: Never lose data again. Saves a snapshot of your entire session on a configurable schedule, in plain text files, so even if your entire browser config gets deleted, you won't lose your session. - Unload tabs to save memory: If you unload a tab, it stays in the tree and functions kind of like a bookmark, using no resources and no space in the tab bar. Then if you open an unloaded tab again later, it goes right back where it was. Tabs unloaded this way are fully unloaded, making them even more lightweight than the "discarded" tabs some other extensions use. - Save and restore entire windows: If you close a window, it stays in the tree as a saved window, complete with all its tabs, bookmarks, notes, etc. Then you can re-open that same window again later, with all the same tabs. - Tab groups: Tabs are grouped automatically into nested structures, and can easily be operated on as a group. Move groups around easily, even between windows. Can also mark multiple groups and do batch operations on all of them at once. - Open new tabs next to current: If you're in the middle of your tab bar and open a new tab, it won't open alllllllll the way over at the right edge, where it could be hundreds of tabs away. Instead it opens immediately to the right of the current tab, automatically grouped as a child of the current tab. - Notes and tasks: Take notes, both short and long notes, right in the tree. Organize your tabs into groups, nested as deep as you like. Add checkboxes to indicate tasks, using a variety of task states, and track progress using todo lists and automatic progress summaries. - Bookmarks: While not as essential when you can just unload a tab and return to it later, bookmarks are still useful sometimes, so bookmarks can be kept in the session tree along with everything else. - Pinned tabs: Move tabs or entire branches into or out of the "Pinned" heading at the top of a window to pin/unpin them. Not as essential with this installed, since tabs remember their positions anyway, but still nice sometimes. - Full keyboard and mouse support: A keyboard is strongly recommended for most tree management workflows, but a mouse is easier for new users, and has a few extras... like drag a branch out of the tree to paste it as Markdown, or drag text into the tree to add notes. - Cross-browser compatibility: Works in nearly all browsers, so you can use whatever browsers you like. For example, close your session in Chrome, then open it in Firefox right where you left off. - "Tree Style Tab" style sidepanel: Displays tabs in a side panel, showing only the tabs and notes in the current window. This is "Window" mode. - "Tabs Outliner" features: Can import your old sessions from Tabs Outliner, for a nearly effortless upgrade. Also, to help ease the transition, it can operate as a full session view in a separate window if desired. - Free and Open-Source: The only way to build software which lasts long-term. - Privacy: The extension is designed to make sure you own your data, and prevent any data from ever leaking to third parties without your consent. - Sync: Coming soon. Synchronize your tree in near real-time between all your browsers, even if they're not the same type of browser. Can use a self-hosted server for maximum privacy, with no data leaking to corporate clouds. This extension is meant for people who need to keep track of many things. You can build your own entire workflows in the "tree", like a personal Kanban of sorts, or a "GTD" / "Getting Things Done" workflow, right in your browser.

Growth

WindowUsersChangeRatingsRating
7 days−7−3.8%00.00
30 days+9+5.3%00.00
6 months+121+212.3%00.00

Version history

8 versions recorded
0.1.181.010 Apr 2026
0.1.177.04 Apr 2026
0.1.156.031 Mar 2026
0.1.145.022 Mar 2026
0.1.124.013 Mar 2026
0.1.97.16 Mar 2026
0.1.80.028 Feb 2026
0.1.73.025 Feb 2026

Details

Category
Functionality & UI
First seen
25 Feb 2026
Size
212 KB
Languages
en
Pricing
Free
Privacy policy
toykeeper.net
Support
toykeeper.net
Extension ID
gfnmccemfbnmocdalckdammbhabfpmie

Permissions and risk

Moderate riskimpact 2, likelihood 2
Permissions
sidePanelstoragedownloadstabsalarms

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