Check that the UserAgent overrides are working correctly and are appropriate for the ESR 91 build.
Some pages which I'd expect to work well (e.g. DuckDuckGo) are rendering poorly; this could be because the UserAgent overrides for the sites aren't working correctly.
The issue with DDG turned out to be related to incorrect values being sent for Sec-Fetch-* headers. This has now been fixed, so I'm closing this as completed.
Check that the UserAgent overrides are working correctly and are appropriate for the ESR 91 build.
Some pages which I'd expect to work well (e.g. DuckDuckGo) are rendering poorly; this could be because the UserAgent overrides for the sites aren't working correctly.