Selenium IDE 3.17.4, (Firefox 115.8.0esr and current Firefox 123.0.1):

- Shows deprecation components error in devtools console that distracts from real errors/warnings during development/testing.
- XML (http content-type text/xml or application/xml) are not rendered as foldable xml tree when this addon is active.

So enable this addon only when you really need to work with it.