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Firefox supports loading about:config settings using user.js file that does not support even the basic thing Javascript is supposed to support (discuss.tchncs.de)

submitted 1 year ago by cy_narrator@discuss.tchncs.de to c/firefox@lemmy.ml

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Why use .js extension if it does not even support what Javascript is supposed to support. Here is my user.js file that does not work in Firefox: https://pastebin.com/QZXL0YJp

However the following works: https://pastebin.com/xEjh7g9U

I wonder why not implement a full Javascript engine to read in those configuration files, it kind of sucks to keep on typing user_pref( in every line when one could put all the configs in a list and loop over it and use user_pref() to apply them.

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[–] 0v0@sopuli.xyz 41 points 1 year ago

https://stackoverflow.com/questions/10602504/how-does-user-js-work-in-firefox-in-detail:

It just looks like a JavaScript file. Once upon a time in Netscape 3 and maybe 4 it actually was, but now it's just a file with a .js extension and a very restricted syntax that's parsed by a separate (non-JS) parser and not executed in any way.

[–] v12riceburner@lemmygrad.ml 11 points 1 year ago

Code execution increases security risk which requires more work to make sure they're doing it right. Better to ship something than nothing