they make it so you can plug in lights for decorations. That is called a receptacle, not a plugin, right?
go to you dashboard/click on plugins down on the left hand side/your now at the plugins directory/if you want to look for plugins to add to your existing plugins/click on add new and search.
Most modern browsers include support for plugins.
You drag it into the plugins folder. If you want plugins in your minecraft server use bukkit, not the vanilla minecraft server.
The more popular anything is the more that someone will charge for plugins. The more people will charge for plugins the more chance that some plugins will be written by people who enjoy writing plugins for the fun of it and so the plugin is either free or shareware. To get all plugins for a paticular program will mean a 24/7 chase around the world for a time measured in years
No minecraft plugins will not give you a virus if they are from a high quality source
Yes you can download plugins for Roblox Studio yet there is not many out there.
Install bukkit
Just go to bukkit.org and download craft bukkit and install the plugins that you want
onone plugins are very good go to site and see if they sweet your needs,and look at alien skin site for plugins they also have good stuff
Plugins can normally be removed through the Control Panel. Go to 'Add Remove Software'.
You can search for free plugins at Adobe Exchange. See related link
There are some free plugins at the Oblivion Nexus (I think).