Allows to install plugin from plugins.intellij.net
site right from the browser by using bookmarklet. Just click on bookmark and plugin will be installed!
After installing the plugin, add the bookmarklet Plugin installer
by dragging it to browser's Bookmarks/Links toolbar.
Now to install new plugin, make sure IDEA is running, navigate to the plugin page on plugins.intellij.net and click the "Plugin installer" bookmark.
You can also install GreaseMonkey script to automatically add the "Install Plugin" link to any plugin page.