Bug 1577930 - Hide the urlbar zoom button when typing in the urlbar. r=mak

Differential Revision: https://phabricator.services.mozilla.com/D61362

--HG--
extra : moz-landing-system : lando

browser/base/content/browser.css

@@ -699,6 +699,7 @@ toolbar:not(#TabsToolbar) > #personal-bookmarks {
 
 #urlbar-input-container[pageproxystate=invalid] > #page-action-buttons > .urlbar-page-action,
 #identity-box.chromeUI ~ #page-action-buttons > .urlbar-page-action:not(#star-button-box),
+#urlbar[usertyping] > #urlbar-input-container > #page-action-buttons > #urlbar-zoom-button,
 #urlbar[usertyping] > #urlbar-input-container > .urlbar-history-dropmarker,
 #urlbar:not([usertyping]) > #urlbar-input-container > #urlbar-go-button,
 #urlbar:not([focused]) > #urlbar-input-container > #urlbar-go-button {