Update readme

README.md

@@ -24,11 +24,10 @@ Right now, this needs to be installed in debugging / developer mode. Soon it wil
 4. Click the "Load Temporary Add-on" button and then select the downloaded Firefox ZIP file
 
 ## Setup
-**You might need to allow popups if your browser asks for it.**
 
 - Required: Click the extension icon to set your Mastodon instance
   - Only set the domain name (like "infosec.exchange") without http/https or URL)
-- Optional: Change whether to redirect in current or new tab
+- Optional: Change whether to redirect in current or new tab (**for new tab you might need to allow popups if your browser asks for it**)
 - Optional: Change the mode (all sites except those on blacklist (default) / no sites but those on whitelist)
 - Optional: Add domain names to the blacklist/whitelist textarea, one per line, for ex.
   ```