Open a new tab with javascript but stay on current tab
You can't open tabs in the background using javascript because this is set in the user's preferences in about:config, which you have no control over. The setting is:
browser.tabs.loadDivertedInBackground=true
Open a URL in a new tab (and not a new window)
Nothing an author can do can choose to open in a new tab instead of a new window; it is a user preference. (Note that the default user preference in most browsers is for new tabs, so a trivial test on a browser where that preference hasn't been changed will not demonstrate this.)
CSS3 proposed target-new, but the specification was abandoned.
The reverse is not true; by specifying certain window features for the window in the third argument of window.open(), you can trigger a new window when the preference is for tabs.
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