cef_extension_handler_t.get_active_browser

Undocumented in source but is binding to an external library. You might be able to learn more by searching the web for its name.
struct cef_extension_handler_t
extern (System) @nogc nothrow
cef_browser_t* function(cef_extension_handler_t*, cef_extension_t*, cef_browser_t*, int) get_active_browser;

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