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If you want a tolerant society, you cannot tolerate the intolerant.
If you want democracy, you must suppress anti-democratic ideas.
You have to fight for want you believe in, and not let antithetical ideas fester and subvert yours, just because they exploit your tolerance and use the space you give them to fight it.
What kind of comparison is that? sudo is setuid while Firefox and its extensions run as the user you started it as.
Also sudo has just one very specific and limited use case, while Firefox is more of a platform for web content. I could argue that sudo itself is an ‘extension’ to a Linux system, like every application.
You also don’t have to install all of those extension, you can choose which you trust, similar to a Linux system, you don’t have to install every application in the repository.
If you say that the Firefox add-on repo should be more managed like a repository of a Linux distribution, where developers cannot simply upload their own software, but need to find a trusted maintainer first, I could agree to that. But that would mean more work and overhead.