How to remove unnecessary Firefox plugins

Plugins are added by third-party applications to Firefox which add some kind of functionality to the browser. While some plugins make good sense, say the Quicktime plugin for instance, some others are not that easily understandable. Why would I need a Microsoft Office plugin for instance ?

You can check the installed plugins by entering about:plugins in the address bar. The list contains all available plugins that are currently loaded in Firefox. Information like the name, location on the hard drive and a short description are available. The description helps to determine if that plugin is actually needed on your system.

My preferred solution for plugins that I (think I) do not need is to create a temporary directory and move all unnecessary plugins into them. This ensures that I can move them back if I should discover that I do need the plugin.