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This is a Firefox add-on which provides ability to operate tabs as "tree".

New tabs opened from the current tab are automatically organized as "children" of the current.
Such "branches" are easily folded (collapsed) by clicking on down-triangle shown in a "parent" tab, so you don't need to be suffered from too many visible tabs anymore.
If you hope, you can restructure the tree via drag and drop.

* Such a tree of tabs will behave like a visual browsing history for you.
For example, if you see a list of search results for a topic, you'll open each search result link in new child tab.
For more details you'll also open more descendant tabs from them.
You'll easily dig and dig deeply, without lose your browsing trail - if you hope to go back to the original search result, you just have to switch to the "root" tab.
* Moreover, you'll treat tree of tabs just as "grouped tabs" for similar topics.

Anyway this addon just provide uncolored "tree" feature.
Please enjoy as you like!

Tips:

* "F1" key toggles the TST sidebar.
* "Tree Style Tab" toolbar button also toggles the sidebar. If it's unnecessary, you can remove it from the toolbar.
* There are more addons extending usability of TST's sidebar, e.g. a small "Bookmarks" sidebar panel below tabs.

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3.1.8 版的發行公告

3.1.8 (2019.9.13):

Optimize internal operations for better performance and less memory usage. (Some ideas are contributed by bb010g. Thanks!)
Become more safe to accidental recursive references of tree structures.
Reopen same site tab with the container inherited from the current tab correctly, when the tab is opened as a child of the current the.
Don't apply special new tab behaviors (ex. auto-attach to the current tab) to restored single tabs.
Don't apply special new tab behaviors for Ctrl-T or other commands, to tabs opened with URL (ex. opened from bookmarks or the location bar), even if the about:blank is choses for the default page of new tabs.
Don't invert children order for a restored parent tab.
Apply custom behavior of closed parent tab correctly when a parent tab is closed as a solo tab by an action inside the sidebar.
Accept dragged tabs from another Firefox instance as URLs.
Treat a tab dragged from the native tab bar to the sidebar as is instead of as a URL string, if possible. (You can deactivate this new behavior with setting guessDraggedNativeTabs to false.)
Refresh indent level of tabs detached from a window by drag and drop correctly.
Update visibility of the scrollbar when tabs are shown or hidden, for better compatibility with other addons like the Simple Tab Groups.
Brush up appearance of some UI elements in the options page.
Restructure some options under the "New Tabs Behavior" section for better findability.
URL like ext+treestyletab:group?(title) is available to open a group tab with specific title.
Show text-shadow with correct color for better readability of text with non-default theme.
Update de locale by SammysHP. Thanks!
Update fr locale by ariasuni (and DarckCrystale.) Thanks!
Update ru locale by wvxwxvw. Thanks!

3.1.7 (2019.8.9):

Introduce guards for cyclic reference around restored parent tabs.
Update ru locale by wvxwxvw. Thanks!

3.1.6 (2019.8.8):

Introduce new custom URI ext+treestyletab:group to open a blank dummy tab for grouping of tabs, which replaces about:treestyletab-group.
Restructure config UI for the behavior around closed parent tab.
Optimize tree restoration on the startup.
Don't try to "fix" tree structure when multiple tabs are moved at a time as a set. This should improve compatibility with other addons which switch visible tab sets.
Introduce a guard for cyclic reference about the tree structure.
Disallow to put unrelated tab inside a tree including hidden parent tabs.
Remove obsolete codes deprecated on Firefox 70.
Update fr locale by narzb. Thanks!
Update ru locale by wvxwxvw. Thanks!

3.1.5 (2019.7.9):

Make subpanels more secure.
Provide --throbber-animation-steps custom property to allow customization for animation frames of throbbers.

3.1.4 (2019.7.5):

Use more safe combination of system colors on the "High Contrast" skin.
Apply style rules for active/inactive windows on the "Sidebar" skin.
Fill SVG icon with the color of tab labels correctly for about:debugging tabs.
Expose "(no control)" choice for options about new tab positions, and set it as the new default value for new tabs opened with the "New Tab" button or the Ctrl-T keyboard shortcut.

3.1.3 (2019.7.1):

Allow to import dragged tree from other Firefox instances.
Respect option for treatment of new blank tabs opened from outside of TST, event when browser.tabs.insertAfterCurrent is configured to true by the user.
Restrict maximum height of the subpanel.
Prevent too frequent detaching of clicked/dragged tab on Windows and macOS. This change is just a workaround, and we still need to wait for complete fix of the bug 1561522 and 1561879 on Firefox side.
Store chache of tree to first tabs in windows instead of last tabs, to reduce bloated session data.
Add ability to store cache of tree to windows instead of tabs to more reduce bloated session data, but disabled by default for safety.
Prevent too much autoscroll while tab dragging. (If you see too slow autoscrolling and want more speedy scroll, please shake your mouse on the edge of the scrollable area.)
Show favicons for new blank tabs correctly. (regression on 3.1.2)

3.1.2 (2019.6.21):

Go to the options page to help granting of the permission, when a notification message about missing permission is clicked.
Hide the subpanel header when the last subpanel is unregistered.
Keep tree structure after a tab is reopened by other addons like Temporary Containers.
Keep tree structure of tabs moved between windows, even if they were moved across windows again and again.
Don't open (or keep opened) needless group tabs for closed parent tabs, when all children are closed together with their parent.
Optimize operations to update "sound playing" and "muted" state of tabs.
Add a link to open the options page itself in a tab, under the "Development" section of the options page.
API for other addons: wait-for-shutdown notification is now delivered. It allows helper addons to notify their uninstallation (or just disabled) to TST.

3.1.1 (2019.6.13):

Handle middle click on blank area of the sidebar correctly. (regression on 3.1.0)
Don't close a tab with middle click on its indent area.

3.1.0 (2019.6.13):

Add ability to embed arbitary contents provided by helper addons as a "sub panel" in the sidebar, via the SubPanel API.
Add commands to operate ths subpanel with custom keyboard shortcuts. By default F2 is mapped to toggle the subpanel frame.
Treat clicking on the indent area as clicking on the corresponding tab. (regression)
Synchronize order of tabs more correctly even if tabs are rearranged by other addons while synchronizing.
Select contents of the title field in bookmarks dialog by default.
API for other addons: tab-clicked notification is now delivered after tab-mouseup. (by xzn, thanks!)

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