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This type of plugin allows you to add a stylesheet (CSS or LESS) that renders elements in Author mode.

To specify additional stylesheets, edit the plugin descriptor and add <extension> elements that point to them, as in the following example:
<extension type="AuthorStylesheet" href="showTables.css"/>
<extension type="AuthorStylesheet" href="hideButtons.css"/>

Using this mechanism, you can add one or more CSS stylesheets to merge with the existing ones. Whenever you add a new stylesheet using this plugin, it will have priority over all other stylesheets applied on the file edited in Author mode.

If your implementation requires more flexibility (such as a dynamic change of the stylesheet), you should consider using the StylesFilter plugin extension.