Note that there is also http/3 coming.

• https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
• https://en.wikipedia.org/wiki/HTTP/3
• https://en.wikipedia.org/wiki/HTTP/2

What reasons do you have that you want to disable http/1.1 ? Isn't your Firefox using http/2 when possible ?

yes Firefox using http 2 and http 3 when it is possible. my resson is personal and i prefer to keep it for me.

did u know how to disable http1?

Thanks for the understanding.

I'm not aware of a way to disable HTTP/1.1 or lower and I don't know in what cases Firefox switches to HTTP/1.1.

• https://searchfox.org/mozilla-release/search?q=HttpVersion&path=&case=false&regexp=false
• https://searchfox.org/mozilla-release/source/netwerk/protocol/http/AlternateServices.cpp#line-560