Read that permission again and really think about what it means. But there is an all-encompassing permission to " read and change all your data on the websites you visit" that is wildly prevalent Huele found it in 71 percent of the top 500 extensions in the Chrome store. What exactly an extension can see depends on its permissions, which you accepted (like it or not) when you installed it. In contrast, the content script can interact with web pages, and for instance access and change what is displayed.Message passing is then used between the content script and the extension core to try and prevent malicious websites from getting access to the sensitive browser APIs, even in the presence of badly written or buggy extensions. are split into a content script and a core script, and only the core gets access to these APIs (like your browsing history), but cannot directly interact with any web pages. At the same time, extensions also need to deeply interact with the website's code, so that they can change their behavior or looks. Unlike websites, extensions need access to more sensitive APIs to implement their functionality, such as access to the list of open tabs, the browsing history, or the cookies.
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