To see a website your computer must download and save all the information on your computer.
Afterwards your web browser will read this information and display you a website.
The browser is supposed to isolate this process from accessing the rest of your computer. But developers are not perfect and as such this isolation is not perfect either.
That’s why it’s important to keep your browser up to date. If you use old browsers you run into risk of someone taking advantage of known error, which was already fixed.
This is by no means common.
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