Nice post, but I think it's kind of strange to mention extentions in the what is important section, but not in security.
These extentions could be insecure while the browser is secure.
Extentions are developed by someone else... (most of the time).
And when there is a security issue with an extention, the company of the browser won't solve the problem.
You got a good point, extensions can endanger the security of the browser. I will add this to the post.
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