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When visiting a supported site Firefox shows a pop-up message asking if you want to install a WebApp (for instance facebook, pandora, etc). If you accept, the corresponding package is installed (for instance unity-webapps-facebookmessenger, unity-webapps-pandora-com, etc) which among other things involves copying files under folder /usr/share/unity-webapps/userscripts/ (no root password is requested during the process).

My question is: how all this is possible since Firefox is running without root privileges? Couldn't this lead to security issues? Thanks

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That WebApps are not actually applications, there are just links to the sites (like normal bookmarks) + special items in Launcher.

Also this "Apps" are installing only for current user, not for all users.

So no need to have root privileges to "install" them.

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