*Tree Tabs: Cross-browser, more powerful features, and high customizability. (One large difference between TST is: the design strategy. TST is aimed to keep it simple and work together with other addons as possible as it can.) *Sidebery: Another tree addon with powerful features. * Tab Center Reborn: Vertical tab bar without tree. * sidebarTabs: Vertical tab bar with grouped tabs.
For addon authors, Tree Style Tab provides public API. If your addon provides extra context menu items for context menu on tabs, you can easily support TST's context menu with small changes. For more details, see the API document.
*Tree Tabs:
Cross-browser, more powerful features, and high customizability.
(One large difference between TST is: the design strategy.
TST is aimed to keep it simple and work together with other addons as possible as it can.)
*Sidebery:
Another tree addon with powerful features.
* Tab Center Reborn:
Vertical tab bar without tree.
* sidebarTabs:
Vertical tab bar with grouped tabs.
There are more similar projects by someone not me, for Firefox or Chrome. Please try them if TST does not perform as you expected.
## Public API for other addons
For addon authors, Tree Style Tab provides public API. If your addon provides extra context menu items for context menu on tabs, you can easily support TST's context menu with small changes. For more details, see the API document.