1. Open your profile folder
    (Easy access: go to about:support and scroll down to “Profile Directory”, click “Open Directory”)
  2. Create a folder inside of it called chrome (all-lowercase)
  3. Create a [blank, empty, text] file inside of that called userContent.css (uppercase C, and, yes, that's Content, not Chrome!)
    (Windows users: don't forget to show file extensions!)
  4. paste this into it: 
    /* Remove advertisements for Mozilla VPN */
@-moz-document url(about:privatebrowsing) {
	.promo {
		display: none;
	}
}
  5. Go to about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true
  6. Restart Firefox
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