e/Browser extension

Information
has gloss	eng: A browser extension is a computer program that extends the functionality of a web browser in some way. Depending on the browser, the term may be distinct from similar terms such as plug-in or add-on. Mozilla Firefox was designed with the idea of being a small and simple web browser, delegating more advanced functions to Mozilla extensions. Internet Explorer started supporting extensions since version 4.0.
lexicalization	eng: Browser extension
instance of	e/Plugin