Hello, I need to create an extension, in which I change a parameter of an ID in HTML, (maxlenght), but only in a certain URL, is it possible?
Yes this is possible and it’s even a very basic use case for an extension.
Have a look at this tutorial about how to create a basic extension.
Then change the borderify.js script (which is javascript code that runs within the page(s) of your choice) to get the element you want to change (use document.querySelector() for doing so), then element.setAttribute("maxlength",newMaxlength) to change the attribute value.
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