Disabled page action for all but http(s)

background.js

@@ -4,7 +4,7 @@ chrome.runtime.onInstalled.addListener(() => {
 	chrome.declarativeContent.onPageChanged.removeRules(undefined, () => {
 		chrome.declarativeContent.onPageChanged.addRules([{
 			conditions: [ new chrome.declarativeContent.PageStateMatcher({
-				pageUrl: { },
+				pageUrl: { schemes: [ 'http', 'https' ] },
 			})
 			], actions: [ new chrome.declarativeContent.ShowPageAction() ]
 		}]);