you really can't stop people from snooping on your page source to see what plugins you are using but by default, wordpress places an index.php on your plugin directory to prevent your server to list out a directory listing of your plugins. You may like to redirect your visitors back to your main page when they try to access your plugin directory with the following modification on your index.php file placed in these directories.
Aside from the index.html file thrown into those directories, make sure you rename your theme folder or if you leave the default name people will be able to see it by looking at the source code of the main page.
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