I have tested it on both Wikipedia and the Commons. It works great. For more info read the talk page here:
I am an admin on a Wikia wiki too, and would like this to be a preference on that MediaWiki installation too. That is why I am requesting here for it to be a preference on all MediaWiki installations.
There are similar bug requests on Bugzilla, but they are not what I want. I want all search clicks to open a new tab. I do not want to have to middle click, or shift-enter, or right click. Plus I do not want to have to deal with browser differences. I just want
added by the preference.