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Javascript doesn't work in my mozilla 7.0.1.

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I wrote a small javascript in url bar and nothing happened. javascript:alert("hello"); works fine in IE and Google Chrome.

I wrote a small javascript in url bar and nothing happened. javascript:alert("hello"); works fine in IE and Google Chrome.

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That feature was pretty much removed for security reasons AFAIK. See also https://support.mozilla.com/en-US/questions/885558

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Use the Scratchpad (Shift+F4) instead of the location bar to run JavaScript.