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Neither flash nor java are "enabled by default.". I think that's a poor analogy. JavaScript engines are built directly into the browser.

• cm2187 12y ago
  Flash runs by default and without consent from the user in most browsers. Not sure what you mean by "not enabled by default" then.
  • nkozyra 12y ago
    When you install a browser, Javascript is enabled. You need to actively install and add Flash and Java to modern browsers.