Browser extensions are identified through the use of a vendor prefix,which indicates the browser vendor that created and supports the property.

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Quizplus · Accepted Answer

Browser extensions are indeed identified through the use of a vendor prefix that indicates the browser vendor that created and supports the property. This is done to avoid conflicts with other properties and to differentiate the extension's features from standard web technologies. Examples of vendor prefixes are -webkit- for Google Chrome and Safari, -moz- for Mozilla Firefox, and -ms- for Microsoft Edge.

Browser Extensions Are Identified Through the Use of a Vendor