A browser extension is a software module for customizing a web browser. Browsers typically allow users to install a variety of extensions, including user interface modifications, cookie management, ad blocking, and the custom scripting and styling of web pages.[1]
Browser plug-ins are a different type of module and no longer supported by the major browsers.[2][3] One difference is that extensions are distributed as source code, while plug-ins are executables (i.e. object code).[2] The most popular browser, Google Chrome,[4] has over 100,000 extensions available[5] but stopped supporting plug-ins in 2020.[6]