Description

1. Create a new style with:
   @-moz-document url-prefix("https://www.instagram.com/p/") {
   /* Some css effects */
   html {
   opacity: 0.1;
   }
   }
2. Visit a not-"/p"-url like https://www.instagram.com/gslin/ using Firefox.
3. Click one photo, and the url will change to https://www.instagram.com/p/...

Stylus in Brave (Chromium) will update the style, but not in Firefox.

System Information

• OS: XUbuntu 22.04 (XFCE)
• Browser: Firefox 139.0 (64-bit)
• Stylus Version: 2.3.14

Screenshots, links, CSS