Firefox browser fails to load websites, here is the fix

A strange bug has appeared in Firefox which means Firefox users cannot load any website in Mac, Windows and Linux versions of the browser. While the devs are working on a fix for the bug, there is a fix you can apply to resolve the issue…

Affected users just see their tabs spinning forever and they don’t finish loading to view the page.

The main issue preventing pages from loading seems to be a file Infinite loop bug Its HTTP3 implementation for Firefox. This essentially suspends the browser process indefinitely.

In particular, the current theory is that one of Firefox’s data analysis services was recently upgraded to an HTTP3-compatible backend and the browser is unable to resolve it. The actual implementation error will persist for a while, but only appeared because Firefox tries to connect to data analytics servers almost immediately after launching the app.

Luckily, there are very few real websites that actually care about HTTP3 and almost everyone is still using outdated standards or backup provisioning. This means that HTTP3 capability is not yet required for modern web browsing. The workaround for this error is to simply disable HTTP3 loading in Firefox entirely. To do this:

  1. Open a new Firefox window.
  2. Type about:config in the URL bar. This will open the settings screen.
  3. Look for the “network.http.http3.enabled” parameter.
  4. Set this parameter to false to disable HTTP3.
  5. Then close Firefox completely and restart it.

This workaround applies to all desktop versions of Firefox, so it will work whether you’re on Windows or Mac.

Of course, once you’ve fixed the actual software bug, you’ll want to go back and re-enable HTTP3 so you can use HTTP3-dependent services in the future.

(The iOS version of Firefox is not affected by the bug because its main rendering engine is WebKit, like Safari. Indeed, on iOS, Apple does not allow third-party browsers to use its own players for security reasons .)

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