Mozilla not using http2

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Mozilla Browser doesn't use http2 on my online site, but it uses http2 on my local.lan site. Weird, since both are coming from the very same server. I tested http2 availability via curl and got a 200 response with all headers. The only difference between my local and my online site, is the online version has more restrictions, and more modules in use. So my question is is there any module that Mozilla prevents using http2? Any help would be greatfull.

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Christian Feilert On

Hei, first of all. I will thank u all. There wasn't any http2 issue. with firefox, i totally forgot about the service worker. Unregistered the worker and, all seems fine.

i'm the one to blame.