We looked at this, but unfortunately the fallback from failure-to-load-JQuery is quite difficult, as we can no longer use the standard JQuery ready event -- which we use all over the place.
In all honesty, unless this is a really prevalent problem, you're better off trying to get google unblocked.
(Also: who blocks Google? That is a little crazy.)
( I do, using pi-hole )
5 years later, another question was made regarding the same subject: Use of ajax.googleapis.com not China friendly
Since google domains were blacklisted on my local network, I'm no longer able to use SE websites.
- Why do SE still include google resources on their source code, when it's well documented    that they use it to track user activity?
- What are the technical reasons for this? Do they still apply 10 years later?
How can I use SE websites without loading jquery from ajax.googleapis.com?