As noted elsewhere in the thread, Microsoft does this as well, and Opera used to do this for broken high-profile websites: https://www.opera.com/docs/browserjs

As noted elsewhere in the thread, Microsoft does this as well, and Opera used to do this for broken high-profile websites: https://www.opera.com/docs/browserjs/ https://www.opera.com/docs/browserjs/ Edit: Even Chrome and Safari used to do it: https://dev.opera.com/blog/opera-s-site-patching/ https://dev.opera.com/blog/opera-s-site-patching/