Firefox can display the contents of an XML file in a nice tree view. I use this feature regularly to browse through large (> 100K) XML files, because Firefox is always open on my desktop and it's easy just to drag&drop the file into the browser window. Unfortunately the "Find" (Ctrl+F) functionality breaks in case of XML.

I did not try this with smaller files (only with a few ~300K files) thus I do not know whether it is inherently broken or it just fails to work with larger files. Try it yourself.
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