I have, like many people, tinkered with it before. It is the sort of language you can tinker with, much to the detriment of the users of web sites eveywhere...
I would however recommend reading up on the language properly. It is not quite as bad as it looks. I have used a lot of languages in the past and they all have quirks
As a C programmer you find the way the data types are handled a surprise. There are a few distinct types, and they are interchanged automatically. Numbers are all floating point (which is fun). There are objects which allow mapping of names to data, and also arrays which work in a similar way. The fact you can create literal functions which have a lexical scope are also rather run but typical of object oriented programming which fits well with an event drive UI model used by browsers.
I suppose I better fix my photo site though as that never worked on chrome. Far too much else to do.