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how they did this( allow user choice the avatar not upload)

i'm searched the community, almost the answer is you can not do this ,but when i tried this forum, they did it.
when you click "change picture", you got this:
when i check the source code found this:<link rel="stylesheet" type="text/css" href="/plugins/avatarstock/design/avatarstock.css?v=1.2.2.57696e31" media="all" />
is this addon? but i cant found a addon named avatarstock or any post include "avatarstock"
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Probably they have created that addon for themselves and did not share it with the vanilla community.
This appears to be a hosted only addon called Avatar Pool: https://support.vanillaforums.com/discussion/5765/is-it-possible-to-define-a-preset-of-avatars-we-create-for-our-users-to-choose-from-hosted-version
This seems easy enough to create, go for it!
Plugin quickstart: http://docs.vanillaforums.com/developers/plugins/quickstart/
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