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I cannot see my plugins and add-ons. I want to activate one of them.

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I recently downloaded and installed Stop Autoplay 1.0. I want to see all my plugins and add-ons but I don't see a button to make them appear. Please tell me how to find them. Thanks, Bill

I recently downloaded and installed Stop Autoplay 1.0. I want to see all my plugins and add-ons but I don't see a button to make them appear. Please tell me how to find them. Thanks, Bill

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You can't open Tools > Addons and then open Extensions & Plugins?