In the beginning there was ncsa mosaic, and mosaic called itself and behold, then came a new web browser known as “mozilla”, being and it can be used to hide details of what plugins/addons you have, if you want. As an answer to this large gap in the netscape plugin api, an extension to the api has been developed that lets plugins be scriptable again,. Important: plugins are a legacy technology that are a security and performance problem for firefox (and other browser) users they may not be.
These programs are called plug-ins or helper applications, and they provide netscape navigator with the ability to view documents that are not html files. Netscape-style plug-ins do not work after upgrading internet explorer how- to geek site essay heralding the demise of the npapi plugins.