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Q: Is Maxthon Cloud browser is chromium-based or firefox-based browser?
A: Actually, it is both.
While you are playing a song in Maxthon Cloud Browser, the components are similar to Google Chrome. However, if you visit to about:config in both Firefox and Maxthon Cloud Browser, it would be different.
NB: I used Firefox Developer Edition
In Maxthon Cloud Browser, it will show you the settings. However in Firefox, it will show you configurations (more advanced than chrome://flags in Google Chrome).