Update README.md

Author: gorhill

README.md

@@ -20,7 +20,7 @@ Report issues specific to the Manifest Version 3 (MV3) variant in the [uBOL issu
 
 #### Performance Issues
 
-Speculated performance issues are marked as invalid and closed if they do not come with actual profiling data from the [Firefox Profiler](https://profiler.firefox.com/)/[Chromium Profiler](https://developer.chrome.com/docs/devtools/performance/reference/) and a fully substantiated analysis supporting the claim.
+Speculated performance issues are marked as invalid and closed if they do not come with actual profiling data from the [Firefox Profiler](https://profiler.firefox.com/) (or [Firefox Profiler for Chromium](https://chromewebstore.google.com/detail/firefox-profiler/ljmahpnflmbkgaipnfbpgjipcnahlghn)) and a fully substantiated analysis supporting the claim.
 
 #### WebRTC Issues