Firefox tab behavior - open at end of list, rather than next to spawning tab?
Solution 1:
In Firefox type about:config in the address bar and hit enter. Click past the warning message.
In the filter field type "insertRelated".
Double click the resulting browser.tabs.insertRelatedAfterCurrent line to toggle it to False.
Solution 2:
Tab Mix Plus addon can help you do this. Just navigate to Tab Mix Plus Options and under Events > Tab Opening tab, and clear the checkboxes near
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Open new tabs next to current one
and
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Open other tabs next to current one.