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Download Opera browser with:
Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Is it possible to block the ability to download add-ons (plugins) ?
The only supported plug-in is Flash. Regarding extensions (add-ons), I don't think there's a way to block the installation.