With the November 8th, 2023 (v. 6.9.2) update to the Enpass browser extension for Firefox on Windows, XML no longer displays inline -- I need to "view source" to see XML now. If I disable the extension, XML displays correctly, as before.
Windows version: Windows 10 Enterprise, 22H2, OS build 19045.3570
Firefox version: 119.0.1 (64-bit)
XML displays as usual in Chrome with the latest version of the extension enabled.