Have they been reviewed and QAed by my Linux distribution? No.
Downloading and running random stuff is a recipe for disaster. Did we learn nothing from ActiveX? It's not that I directly mistrust the original authors or reviewers. It's that it's circumventing the distributor, and is a prime choice for subverting to expose users to malware. So I treat the entire concept with great suspicion. From my POV I place as much trust in this website as I would in any other untrusted random website: None.
extensions.gnome.org is not a solution, it's a problem. These extensions should be properly packaged and released so that they can go through the proper release and distribution process. The entire concept is just a half-assed workaround to cope with the fact that the GNOME shell is a crippled disaster. These should be packaged and provided with/alongside the shell, rather than treated like orphaned stepchildren.
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