Honestly, the Google Toolbar is mad annoying. For those sites which require the pop-up blocker to be disabled in IE, you not only have to do that but also have to turn off the Google Toolbar. There are some other annoying feature that go along with it and it eats up more resources than necessary.
My advice: don't install it. Unless you really don't know what you're doing on a computer or on the Internet, then you don't need it.
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I swear, troubleshooting is a science: the best discoveries are always on accident...