'JavaScript: how do I save and apply my changes to a script loaded by a website

I am on a podcast website where they have a rewind button to rewind back to 10 seconds ago. I wanted to change it to 5 second ago.

I found the onClick handler in its source code and edited the code but it didn't work and it still rewinds to 10 seconds ago not 5 seconds ago.

I am pretty sure I edited the right code but it just didn't get saved and applied to the webpage. Am I missing something here? enter image description here



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