A guess: "everyone" is a singular (not plural) indefinite pronoun. Thus it should be "everyone is using JavaScript in one or the other form". Can Pawel edit his post?
Edited.
Thanks for the correction along with the link to its explanation.
I appreciate your efforts and going one extra mile long to provide the link to the explanation along with the timestamp.
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A guess: "everyone" is a singular (not plural) indefinite pronoun. Thus it should be "everyone is using JavaScript in one or the other form". Can Pawel edit his post?
See e.g. (at 02 min 38 secs):
youtube.com/watch?v=1Dax90QyXgI&t=...
Edited.
Thanks for the correction along with the link to its explanation.
I appreciate your efforts and going one extra mile long to provide the link to the explanation along with the timestamp.