Update README.md

Author: thedoggybrad

README.md

@@ -5,6 +5,7 @@ This is the VirusTotal Website Security Check, it is created by TheDoggyBrad Sof
 https://thedoggybrad.github.io/vt_web_check/
 
 ## Firefox Add-on (Manifest v2)
+Note: Not working, wait for the new working version - currently under review by Mozilla
 https://addons.mozilla.org/en-US/firefox/addon/vt_web_check/
 
 ## Edge Extension (Manifest v3)