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Firefox for Android now supports over 450 add-ons
(www.ghacks.net)
This is a most excellent place for technology news and articles.
When I take an image file and change its extension from webp to png it converts the binary data, so I imagine your OS' default file manager would do that too. Maybe not tho.
What OS & version are you using that automatically converts file types when you change the filename via the default file manager interface? I have never heard of this function before.
Some file managers on linux can do this, but it's definitely not a default on most.
Holup