diff --git a/.eslintrc b/.eslintrc
index cee33bfa..e85b0c08 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -11,7 +11,6 @@ env:
 globals:
   # messaging.js
   KEEP_CHANNEL_OPEN: false
-  RX_SUPPORTED_URLS: false
   FIREFOX: false
   OPERA: false
   URLS: false
diff --git a/edit.js b/edit.js
index 7360c046..99308bd4 100644
--- a/edit.js
+++ b/edit.js
@@ -1666,7 +1666,6 @@ function showLintHelp() {
 function showRegExpTester(event, section = getSectionForChild(this)) {
 	const GET_FAVICON_URL = 'https://www.google.com/s2/favicons?domain=';
 	const OWN_ICON = chrome.runtime.getManifest().icons['16'];
-	const RX_SUPPORTED_URLS = new RegExp(`^(file|https?|ftps?):|^${URLS.ownOrigin}`);
 	const cachedRegexps = showRegExpTester.cachedRegexps =
 		showRegExpTester.cachedRegexps || new Map();
 	const regexps = [...section.querySelector('.applies-to-list').children]
@@ -1696,7 +1695,7 @@ function showRegExpTester(event, section = getSectionForChild(this)) {
 	});
 	chrome.tabs.query({}, tabs => {
 		const supported = tabs.map(tab => tab.url)
-			.filter(url => RX_SUPPORTED_URLS.test(url));
+			.filter(url => URLS.supported.test(url));
 		const unique = [...new Set(supported).values()];
 		for (const rxData of regexps) {
 			const {rx, urls} = rxData;
diff --git a/messaging.js b/messaging.js
index 94c058dd..a5062b99 100644
--- a/messaging.js
+++ b/messaging.js
@@ -3,25 +3,31 @@
 
 // keep message channel open for sendResponse in chrome.runtime.onMessage listener
 const KEEP_CHANNEL_OPEN = true;
+
 const FIREFOX = /Firefox/.test(navigator.userAgent);
 const OPERA = /OPR/.test(navigator.userAgent);
+
 const URLS = {
   ownOrigin: chrome.runtime.getURL(''),
+
   optionsUI: [
     chrome.runtime.getURL('options/index.html'),
     'chrome://extensions/?options=' + chrome.runtime.id,
   ],
+
   configureCommands:
     OPERA ? 'opera://settings/configureCommands'
           : 'chrome://extensions/configureCommands',
+
   // CWS cannot be scripted in chromium, see ChromeExtensionsClient::IsScriptableURL
   // https://cs.chromium.org/chromium/src/chrome/common/extensions/chrome_extensions_client.cc
   chromeWebStore: FIREFOX ? 'N/A' : 'https://chrome.google.com/webstore/',
+
+  supported: new RegExp(
+    '^(file|ftps?|http)://|' +
+    `^https://${FIREFOX ? '' : '(?!chrome\\.google\\.com/webstore)'}|` +
+    '^' + chrome.runtime.getURL('')),
 };
-const RX_SUPPORTED_URLS = new RegExp(
-  '^(file|ftps?|http)://|' +
-  `^https://${FIREFOX ? '' : '(?!chrome\\.google\\.com/webstore)'}|` +
-  '^' + URLS.ownOrigin);
 
 let BG = chrome.extension.getBackgroundPage();
 
diff --git a/popup.js b/popup.js
index de54567e..813bbd62 100644
--- a/popup.js
+++ b/popup.js
@@ -5,7 +5,7 @@ let tabURL;
 const handleEvent = {};
 
 getActiveTabRealURL().then(url => {
-  tabURL = RX_SUPPORTED_URLS.test(url) ? url : '';
+  tabURL = URLS.supported.test(url) ? url : '';
   Promise.all([
     tabURL && getStylesSafe({matchUrl: tabURL}),
     onDOMready().then(() => {