[djeiasbsbo]

That is not true at all. Browser extensions are written in JavaScript, so the source code can be inspected before installation or at runtime (Debuggers are present in major browsers). It might be the same as running a script or binary without looking at it first but it's not the same as just running a compiled proprietary binary.

[jjbinx007]

Do you analyse the code in your browser extensions every day?

Also, this is likely far beyond the capabilities of the average computer user anyway.