A plug-in is a block of code that is integrated into classic Yandex.Browser and expands its features. In contrast to extensions, a plug-in does not normally have an interface. Plug-ins are used for playing video and audio in the browser, viewing PDF documents, improving the operation of web services, collaborating on projects in the internet, and so on.
Usually, you need to install plug-ins when you visit a site that has a specific type of content (for example, a video). To display this content properly, you must install a plug-in.
Classic Yandex.Browser informs you that a certain plug-in needs to be installed and offers to install it. You will see a notification in the upper part of the page. You will need to download the latest version of the plug-in from the developer's website and install it yourself.
In the window that opens, find the Plugins section and click Manage individual plugins.
The Plugins page opens, where all installed plugins are listed. To disable a plugin, click the Disable link under its name.
You cannot delete an installed plug-in from the classic Yandex.Browser interface. You must use the standard features of your operating system for deleting an application. Go to Control Panel → Programs and components and delete the unwanted plug-in.