fix: ICON_PREFIX (#1766)

src/common/safe-globals.js

@@ -27,4 +27,4 @@ export const extensionOrigin = extensionRoot.slice(0, -1);
 export const extensionManifest = chrome.runtime.getManifest();
 // Using getURL because in Firefox manifest contains resolved (full) URLs
 export const extensionOptionsPage = chrome.runtime.getURL(extensionManifest.options_page);
-export const ICON_PREFIX = chrome.runtime.getURL(extensionManifest.icons[16].split('16')[0]);
+export const ICON_PREFIX = chrome.runtime.getURL(extensionManifest.icons[16].replace("16.png", ""));