If you're a big dork like me and don't like installing extensions, you can use Tab Groups in Chrome (or any Chromium-based browser). I save groups as sort of temp (ephemeral if I want to impress promptfondlers) bookmarks categorized by whatever miscellaneous stuff.
You can close the group and every tab will reopen when you open the group. When you delete all the tabs, the group is removed from the top of the browser window.
Firefox appears to support tab groups^[https://support.mozilla.org/en-US/kb/tab-groups] if you'd like to try it.