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Pseudos can be selected with JS (which I didn’t realise until shortly) but are only readable. Changing their properties isn’t possible. What you would be looking for is this:

Like Paulie mentioned, the script will need to use a regex and go through the entire stylesheet to find a match. Both the external accessing of the file and especially this search will certainly be a slow and “intensive” approach.

An example, I found it quite complicated: