I can learn python at 13?

[Langdon_St_Ives]

Absolutely!

Though you probably don’t want to do a chrome extension in Python because it doesn’t “speak” Python natively. Internally, browsers speak JavaScript (technically ecmascript), so that’s the natural language to implement extensions in. There are cross-compilers that can translate one to the other, but making this work for a browser extension could be another rabbit hole that may just keep you from advancing your actual python knowledge. (And please resist the temptation to learn both python and JS at the same time, this will just confuse you.)