Firefox Update 114 enables DoH-this may cause issues

[German]The days I noticed some comments in my German blog that users report issues with Firefox. The possible cause is the activation of DNS over HTTPS (DoH) and use of the Cloudflare DNS server, as one user told me.

In this German comment, a reader complains about issues with Firefox 114.x, which is said to show timeouts and various malfunctions and writes (tranlated):

By the way, I'm having massive problems with FF 114.0.1 here right now, partly timeouts when retrieving web pages, browser tab crashes and various addons don't work at times, uBlock didn't block any elements in between, "open in Microsoft Edge" doesn't do anything right now. etc. Previously 113, no problem with that.

Had stuck in my mind with the reply of an anonymous user who left the following information there (thanks for that):

Just a tip because I just noticed this on a system. With the update to 114 DNS over HTTPS was activated on one system. This can cause exactly such a crap, because the DNS of Cloudflare just does not provide suitable IPs for your provider. For example, I can not use the DNS resolver of Quad 9 because otherwise the Epic client tells me I have no licenses for my games.

The comment here, on the other hand, might fall into a different rubric. Now German blog reader Rüdiger contacted me by mail and contributed some enlightening information. He wrote about it:

Firefox Update 114 activates DoH and creates problems under certain circumstances

Hi Günter,

because it is perhaps exciting for your blog reader: With the update 114 Mozilla seems to activate DNS over HTTPS with Cloudflare as DNS resolver in Firefox on some systems.

Effects can be e.g. slow loading of web pages. Experience has shown that a resolver other than that of the provider is not entirely unproblematic, especially with Telekom. Therefore, I have also from the behavior of the browser pretty quickly this setting in the suspicion.

The setting can be found in Security and Privacy at the bottom of DNS over HTTPS. Who has problems should disable this or if you ask me you should always disable this :)

Many greetings

Rüdiger

At this point my thanks to Rüdiger. This hint looks to me (may deceive me) as if it could solve the above problem of the blog reader with the mucking web pages in Firefox. Affected people can check if DOH is enabled.

DNS over HTTPS (DoH) is a protocol for performing DNS resolution over the HTTPS protocol. The goal is to increase user privacy and security by preventing DNS data eavesdropping and manipulation through man-in-the-middle attacks.