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I switched my sidebar tab add-on to Sidebery [0], and that's actually what got me to start using containers (not the other way around).

I have a 'home' container (= sidebar 'tab' of tabs), 'personal code' container (ditto), 'finance' (ditto), and 'work' (ditto). It's not even really that I want to silo their data from each other (I have uMatrix - yes I know, will probably switch to nuTensor - and autocookie delete etc. anyway) - but the organisation into contexts I can easily switch between is amazing.

[0]: https://github.com/mbnuqw/sidebery

Itll show a color next to the tab to indicate that its in a container

In addition to showing the container color, the context menu options to reopen a tab in a container work just fine with tree style tabs.

I think you want Container Tabs Sidebar:

https://addons.mozilla.org/en-US/firefox/addon/container-tab...