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What I should read / watch to be able to write scripts in the future?
How did you learn it?
Thank you for help
but basically you should only know script header metadata which you can see in all user script and then you can make your script works fine in user script manager.
the exclusive API on greasespot is not necessary for all script , and the API version on greasespot is too new that it only work on greasemonkey4+ but not tampermonkey or other gm3 based script manager.