Until recently I have been able to paste a 100,000+ line XML file with very few changes into an editor with the almost-identical XML file, and VS Code responds within < 1 second indicating the diff.

When multiple schemas are active, the schema shown on hover is inconsistent with the errors displayed in the UI. We developed a VSCode extension for our users that ...

So, I do a lot of little side things with XSLT generating HTML from XML. Always worked fine in Chrome. Now, all I get is a blank screen, and, in Inspect Element, this: Code: Unsafe attempt to load URL ...