Few things: - Middle click the Plus button to open a new tab in the same container directly adjacent (instead of at the end) to the current one. - https://add

Few things: - Middle click the Plus button to open a new tab in the same container directly adjacent (instead of at the end) to the current one. - https://addons.mozilla.org/en-US/firefox/addon/simple-tab-groups/ https://addons.mozilla.org/en-US/firefox/addon/simple-tab-gr... allows you to have different groups open within a browser window and switch between them. You can enforce a particular container per group. It may allow different "groups of groups" per window, so you can just use one group per window but use it to enforce the container. - https://addons.mozilla.org/en-US/firefox/addon/search-and-switch-containers/ https://addons.mozilla.org/en-US/firefox/addon/search-and-sw... allows you to type e.g. "co work" in the omnibox to switch containers from the keyboard.