This userscript will disable the numbers of notifications along with forcing all videos to use the h.264 codec rather than VP9/AV1 (but it also limits the frame rate up to 30fps).
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*Works well with any YouTube optimization scripts such as Web Tweaks (both normal and lite versions), Non-Rounded Design with Stylus tweaks included, and more scripts to be applied)*
The userscript version of this will disable most of config flags (including ambient mode and animations), disable the number of notifications to prevent annoyances, forcing both h.264 and limits videos up to 30fps to increase battery life and makes low-spec machines usable to watch videos higher than 480p, along with CSS tweaks to make the topbar opaque and others added to it.
Credits goes to the authors who made this userscript (patch collection by AdashimaaTube, forcing h264 videos with 30fps limit by both JeffersonScher and 0usd, and others that suggested by Joey_JTS).
