No new tabs/windows
Please read this comment before deciding whether to download. (Zotlan)
This just checks all a elements (links) and removes target attribute, so they will not open in new tab. target=_blank is extensively used on the Web, but it is very annoying. If user (especially advanced one) want to open something in new tab he/she will do so manually (i.e. using middle click of moue), so this script make life easier and removes all automatic opening in new tabs.
This is especially important because some webdevelopers and marketing guys thinks this helps in making more advertisements or help user keep on current page. Most people doesn't think so and this script removes this unwanted and very irritating behavior.