How can I change eclipse's Internal Browser from IE to Firefox on Windows XP?

To be more specific I need to change the Internal Browser instead of adding the External Browser through Preferences -> General -> Web Browser.

How to change Web Browser in sts?

Go to your eclipse Window -> Preferences -> General -> Web Browser and you can select your default Web Browser here and if you want to add some other web browser then click on New button and put and and then click on OK and then after your can see your newly added browser in "External web browser" section.

In Preferences -> General -> Web Browser, there is the option "Use internal web browser". Select "Use external web browser" instead and check "Firefox".