You’ll soon find a new “Open links from apps next to your active tab” preference in Firefox’s settings. Look for a new Tabs setting called “Open links from apps next to your active tab.” Turn this on to have links from other apps open right beside your active tab, or leave it off to keep the classic behavior where new tabs appear at the end. The new ‘Open links from apps next to your active tab’ setting will appear in Firefox Preferences (General > Tabs section). Here’s how new tab placement will work:In horizontal tab mode, links from apps appear to the right of your active tab. If the active tab belongs to a tab group, the new tab opens immediately after the group ends.