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The "Default Browser" plug-in is not responsible for the notification mentioned in that tweet. The plug-in has no opportunity to execute code when Firefox is launched, only when instantiated by a web page.

Besides, there's no need for a browser plug-in to detect when Firefox is run: the LaunchServices framework responsible for launching applications on OS X can simply check whether the application it is launching appears to be a web browser.

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Thanks for the correction. The only analysis I have found is this blog post from someone at Opera (Published: 2014-04-07, Updated: 2015-08-26). Do you know when the "Default Browser Helper" plug-in is instantiated? It was shipped in OS X 10.9, so it may no longer be relevant.

https://www.aeyoun.com/technote/default-browser-plugin.html

The plug-in provides a scripting interface that's only available to pages hosted via HTTPS on apple.com. The scripting interface exposes whether Safari is the default browser, and allows for prompting the user to change their default browser. To my knowledge the only place this was used was a "Welcome to OS X Mavericks" page that was shown shortly after installation of that version of OS X. I doubt that it's been used since.

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