I’ve long been a user of the Bible toolbar for Firefox which allows me to search numerous Bible translations online directly from the Bible Gateway site. It is the single most useful Firefox plugin I have come across. However, this morning mgvh has pointed me towards the Tyndale House toolbar for Biblical Studies. This monster of a toolbar will install on both Firefox and IE (if you must!). As far as I can tell, it will do everything but make your morning coffee for you and is probably well worth a look.