About this extension

This is a simple extension that:

Removes the cookie headers for all https://*.youtube.com/watch?* links (requires webRequest and webRequestBlocking perms)
Cancels all https://*.youtube.com/watch?*themeRefresh=1* requests (to prevent a bunch of refreshes when removing cookies)
Refreshes page (requires tabs perm) on client-side redirect to a video (requires webNavigation perm) to mimic disabling the History.pushState API
Checks if your browser prefers dark mode and enables it for video pages and, if so, enables it (since disabling cookies disables it for some reason)

Drawbacksː

When the client-side redirect happens, you are still initially logged in and a request is sent to YouTube that you accessed the video.
It signs you out, so you cannot watch age-restricted videos
It signs you out, so you cannot like, subscribe, or comment

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