V5.1) Dropped 'let'
V5) Updated to a more modular approach and adjusted for dynamic content.
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V4.2) Restructure code where it seems to make more sense. Added a little bit of logging to the console. Might help in trouble shooting if you filter the console by "YouTube Auto-Liker". Increase timer to 2seconds with upper limit of 30seconds (I have to remember not everyone has fiber internet or modern pc).

V4.1) Small changes, feels cleaner.
V4) Efficiencies and handles disabled auto-play for video on new tabs.
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V3) BIIIIG Change.

Instead of waiting X amount of seconds for content to load, we check for content every second for 9 seconds.

AND if we don't find it (subscribe button + like button), you get a console message to bug me to update the script for YouTube site changes. :)
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V2) New version, same function. If you're sub'd it will auto like video after 10 seconds.
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V1) Youtube Auto Liker if Subbed.