Enabling User JavaScript
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User JavaScript is a tool in Opera used to modify Web pages via code on your computer; it makes for lots of tip opportunities! To enable it, start by going to opera:config#UserPrefs|UserJavaScript and checking the box.
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In order to actually use scripts you need to specify the folder where Opera will look for script files. You’ll need to type a path in the field marked “User JavaScript File”. A good idea might be to create a folder inside your Opera preferences folder and use that.
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To apply the changes click the “Save” button. Opera will now execute any User JavaScript files copied to the folder you specified.