With Firefox's tab-groups, the fact it doesn't load tabs at startup until you switch to them, and the TreeStyleTabs extension I can easily and efficiently have

With Firefox's tab-groups, the fact it doesn't load tabs at startup until you switch to them, and the TreeStyleTabs extension I can easily and efficiently have over a hundred tabs "open" and everything still stays fast and efficient and uncluttered. Basically, I never use bookmarks anymore - when I'm researching some topic, I do a bunch of searches, open a bunch of interesting results, and when I need to task-switch to some other topic I shuffle them all off to a tab-group, name it, and come back to it weeks or months later. Another good application is having a tab-group per project - I can have a collection of tabs with API docs, SQL docs, specifications and such, and stash all that state and restore it almost instantly. As added benefit, since Firefox's AwesomeBar will prefer to complete from the names and URLs of open tabs, an easy way to switch to, say, the "CREATE TABLE" docs when I have a dozen identically-iconned tabs open is to just say Ctrl-T, "CREATE T", Down, Enter.