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« Gecko Plugin API Reference « Browser Side Plug-in API


Returns the browser's user agent field. This can be used to handle variations in different browsers (or versions thereof) when implementing your plug-in.


#include <npapi.h>
const char* NPN_UserAgent(NPP instance);


The function has the following parameter:

Pointer to the current plug-in instance.


A pointer to a buffer that contains the user agent field of the browser.


The user agent is the part of the HTTP header that identifies the browser during transfers. You can use this information to verify that the expected browser is in use, or you can use it in combination with NPN_Version() to supply different code for different versions of the same browser.

See also

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 Contributors to this page: teoli, kscarfone, Sheppy, Pmash
 Last updated by: kscarfone,
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