Any reason not to change the manifest to just specify YouTube?

[Gitoffthelawn]

The manifest currently requests access to *://*/*, which is ALL websites.

Any reason not to change the manifest to just specify YouTube?

Because of this issue, AMO and Firefox list this extension as needing permission to "Access your data for all websites".

[michalsykora]

+1 helps with privacy consideration

[Apep-the-snek]

i have a reason: embedded youtube videos on other web sites are a thing, and youtube audio does work on those videos. i would make the manifest to only specify youtube, and have a GUI option to make it apply to all sites, or certain sites.