Fix alias conflict with webextension topic

Author: sudoscrawl

topics/browser-extension/index.md

@@ -1,6 +1,7 @@
 ---
-aliases : browser-extensions, web-extensions, web-extension
+aliases : browser-extensions
 display_name : Browser Extension
+related: web-extension, browser, firefox, firefox-extension, chrome, chrome-extension, mozilla, opera, edge
 short_description : Extend and customize web browsers using client-side scripts and APIs.
 topic : browser-extension
 wikipedia_url : https://en.wikipedia.org/wiki/Browser_extension