Old Chrome plugin manifest: Unrecognized manifest key 'plugins'

I've got a Chrome plugin that I would like to use on current Chrome version but unfortunately upon installing, I get the following error:

Unrecognized manifest key 'plugins'.

The manifest sort-of looks like

{
  ...
  "plugins": [
    { "path": "myLib.dll", "public": true }
  ]  
}

I am assuming that something changed in the way that Chrome plugins are built or what is allowed and what isn't. How can I translate calling a *.dll file from the old format using plugins as a key in the manifest to the new, correct way?

Solution

You can't use NPAPI plugins anymore. You have to replace it with JavaScript or WebAssembly.

https://developer.chrome.com/extensions/npapi:

In September 2014, all existing NPAPI-based Apps and Extensions will be unpublished

https://www.chromium.org/developers/npapi-deprecation:

In September 2015 (Chrome 45) … NPAPI support will be permanently removed from Chrome. Installed extensions that require NPAPI plugins will no longer be able to load those plugins.