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siria
If unsure, just verify by reloading a page, then click "view current useragent string" and it will show which UA was sent. Check this directly after the page load, without doing any changes in between.

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Mello
I'm using your useragents2018 macro with Goanna 76 so have i got this right? The hardcoded youtube UA is taking precedence over the macro2018's mobile UA unless I delete the goanna u/a string in about:config.

Let me reword that:
If a site-specific useragent for the current domain is stored in the prefs, then this string is taking precedence over the global useragent. After all, that's what automatic site-UAs are all about.

If a site-specific useragent for the current domain is stored in the prefs, then this string is taking precedence over the global useragent. After all, that's what automatic site-UAs are all about.

This macro has menu entries to handle both types:
the UA-list in the middle is for setting the global UA, just as in old KM 1.x,
and anything with "automatic" in the name is for handling site-specific UAs.