This is going to be the case automating attack detection against most programs where a portion is obscured.
You say many cases, let's see some examples in Safari.
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There are also WebKit-based Linux browsers, which obviously do not use closed-source OS interfaces.
My pessimistic guess on reasoning is that they suspected Firefox to have more tech debt.
This is going to be the case automating attack detection against most programs where a portion is obscured.