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YouTube Auto-Liker

This userscript automatically likes videos of channels you're subscribed to on YouTube, after you've watched at least half of the video.

Download

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Then install this script from one of the following links:
- GitHub (Recommended)
- Greasy Fork

You can configure the settings by clicking the 'Settings' button under 'YouTube Auto-Liker' in your userscript manager.

Setting	Description	Default
Debug mode	Log debug messages to the console	off
Check frequency	How often to attempt liking the video	5000 ms
Watch threshold	The percentage of the video watched before liking	50%
Like if not subscribed	Like videos from channels you are not subscribed to	off

Add settings:
- Retries - How many times to retry liking upon failure.
- Whitelisted channels - A list of channels to always like the videos of, even if you are not subscribed to them.
- Blacklisted channels - A list of channels to never like the videos of, even if you are subscribed to them.

The userscript itself was inspired by this one by JoeSimmons, which hasn't worked since 2015
The debugger code was adapted from this Stack Overflow answer by arctelix
The settings interface uses GM_config by sizzlemctwizzle