[a3n]

And, to manage lots of open tabs strictly in firefox, use tab groups: https://support.mozilla.org/en-US/kb/tab-groups-organize-tab...

Basically you can divide your open tabs into groups, and then only have one group open at a time. You can easily switch between groups. That way I can switch focus between different subjects that I'm studying.

Unfortunately pinboard can't see firefox tab groups, it only sees all the tabs in all the groups. It would be nice to use pinboard to "save all tabs" for just the currently opened firefox tab group. Maybe some day.