-
Open a Guardian page in a new tab in Firefox. Most of the JavaScript fails. Has been happening for months; I filed issues... nothing.
-
... or, they have way bigger fish to fry. I'd challenge devs to switch (personal) browser for a month and see what their sites are like.
-
My theory: the Chrome monoculture these days means most devs assume stuff works in FF and don't bother testing properly anymore.