Back in September, I reviewed the add-on Tabs Open Relative, which had suddenly become very popular with the release of Google Chrome. The current tab behavior in Firefox is for a new (child) tab opened via a link to do so at the end of the tab bar. However both Chrome and IE8 (Beta) will open the child tab to the right of the current tab (or other child tab). New tabs opened via the new tab button, file menu or control+T will still open at the end of the tab bar. This new behavior will be included in the…