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In Firefox click on the 'Tools' menu (step 1) and select 'Options' (step 2) as shown on the picture.

Click on the 'Content' tab (step 3), check the 'Enable JavaScript' checkbox (step 4) and finally click on the 'OK' button (step 5). This concludes enabling JavaScript for Mozilla Firefox 1.5.

If the problematic Web page (which did not work without JavaScript) is still opened inside Firefox, simply press the 'F5' key on your keyboard to reload it. Now it should work correctly.

Note: This procedure applies to older and/or future versions of Firefox as well, with minor differences. The most important step is to find the 'Enable JavaScript' option and check it.