Quote:Firefox 64 was released this week; the release brought along with it a number of changes including support for multi-tab operations.

Firefox users can Shift-click or Ctrl-click on tabs in the browser's tabbar to select multiple; operations like pinning, closing, or moving can then be executed on the tab stack.

Ctrl-click selects or deselects individual tabs; Shift-key on the other hand selects all tabs between the active tab and the selected tab. Both operations work similarly to how files can be selected in Windows Explorer and other file managers.

Firefox users who used the browser's "Bookmark Tabs" functionality may have noticed that it is not listed anymore when only one tab is selected.
Only Bookmark Tab is available, and that option will add a bookmark that points to the active tab.

How do you bookmark multiple tabs then in Firefox 64 or newer? Simple: by selecting multiple tabs.

Full reading: https://www.ghacks.net/2018/12/14/how-to-bookmark-multiple-tabs-in-firefox-64/