If the plugin has been successfully installed, I'm guessing (as I could not find an account tied to the email you are using) that you don't have the license ordered/entered in for Bonfire.
If you have the plugin and license successfully installed (and are using the current or recent version of the Bonfire plugin) the option to download the browser add-on should be there. While the link to download the extension directly is below, (if you want to try it), I would recommend opening a support request so we can resolve the issue right away.
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