Firefox
From SaniWiki
[edit] Open new tab last, not relative to the current tab
From Firefox version 3.6 the default behavior has been changed into to putting newly opened tab relative to the tab where you clicked the link.
As I usually open a whole bunch of links when reading from RSS and I want to keep some windows always open and in a specific position, so CTRL/-1 etc works, I want the old behavior.
To do this type in about:config in the address bar and change:
browser.tabs.insertRelatedAfterCurrent
to false (double-click).
