This means HTTP3 capability is not yet required to browse the modern web. Luckily, very few real websites actually care about HTTP3 with almost everyone either still using older standards, or providing a fallback. The actual implementation bug will have existed for a while but it has only come to the fore because Firefox attempts to connect to data analytics servers almost immediately after launching the app. In particular, the current theory is that one of Firefox’s data analytics services recently upgraded to a HTTP3-powered backend and the browser is failing to resolve it successfully. This essentially causes the browser process to hang indefinitely. The underlying issue preventing pages from loading appears to be an infinite loop bug in Firefox’s HTTP3 implementation. While the developers work on a solution to the bug, there is a fix you can apply to workaround the issue …Īffected users are simply seeing their tabs spin forever, never completing loading to show the page. We’re sorry for any inconvenience caused.“Ī bizarre bug in Firefox has cropped up that means users of Firefox are unable to load any website in the Mac, Windows and desktop Linux versions of the browser. If you’re still affected, please restart your browser. We disabled the configuration change and confirmed this fixed the issue. Update: Firefox says the problem has now been resolved: “Earlier today, Firefox became unresponsive due to a change in defaults by a cloud provider which triggered a Firefox HTTP/3 bug.
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