- 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 custom scripting and styling of web pages. Browser plugins are a different type of module and no longer supported by the major browsers. One difference is that extensions are distributed as source code, while plugins are executables (i.e., object code). The most popular browser, Chrome, has over 100,000 extensions available, but stopped supporting plugins in 2020. ← Wikipedia
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