Is there a way to control the number of seconds by which to forward/rewind a YouTube video?

the second answer here is the type of script i want to use. However I have to manually run the script in the console on every youtube /watch page I open. I have tried using chrome extensions to run the script automatically when a youtube /watch page is loaded in a tab.

but I get this error:

Uncaught TypeError: Cannot read properties of null (reading 'getPlayer') at < anonymous >:1:56

Please help, thanks!


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