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HTTP3/QUIC Support - Super-slow on Google sites

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I realize HTTP3/QUIC is not officially supported, but Chromium-based browsers have no problems with using it, even with ad-blocking extensions. Mozilla Firefox becomes very slow for Google-based services (Google Search, Gmail, YouTube) and unresponsive when HTTP3 is enabled in about:config. Since QUIC is mostly a Google invention and Google services are the ones that utilize it the most, I wonder if Google deliberately slows down Firefox-based QUIC. The negative effect of HTTP3 in Firefox browsers with Google services is something that I test and experience on multiple networks, devices, device types, and versions of Firefox. I use Wireshark to see if QUIC is the protocol that causes slow downs and it is, but only for Google-based services. There are other non-Google QUIC services and they are actually faster/quicker with Firefox HTTP3 flag enabled. That again makes me wonder if Google deliberately creates an HTTP3/QUIC problem for Firefox...

I realize HTTP3/QUIC is not officially supported, but Chromium-based browsers have no problems with using it, even with ad-blocking extensions. Mozilla Firefox becomes very slow for Google-based services (Google Search, Gmail, YouTube) and unresponsive when HTTP3 is enabled in about:config. Since QUIC is mostly a Google invention and Google services are the ones that utilize it the most, I wonder if Google deliberately slows down Firefox-based QUIC. The negative effect of HTTP3 in Firefox browsers with Google services is something that I test and experience on multiple networks, devices, device types, and versions of Firefox. I use Wireshark to see if QUIC is the protocol that causes slow downs and it is, but only for Google-based services. There are other non-Google QUIC services and they are actually faster/quicker with Firefox HTTP3 flag enabled. That again makes me wonder if Google deliberately creates an HTTP3/QUIC problem for Firefox...

Krejt Përgjigjet (2)

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Hello,
Lately scammers have been posting   (mainly in threads where no reply has been posted yet),   claiming to be Mozilla experts and asking users to either call a so-called toll-free phone number or giving them a link to a site, where they are promised to get expert help.
These posts of course are scams.
Hopefully informing you about this will scare them off and you won't see such scam post.

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Hi Sergey, I would guess that most support volunteers haven't experimented with HTTP3 yet. You could search in Bugzilla to see whether there is a bug on file already to try to resolve site-specific issues or whether a new one needs to be filed:

https://bugzilla.mozilla.org/