That first one "works on my computer", and the second one also works (but is purported not to).
I've long been confused when reading how Firefox doesn't work everywhere. Now I'm even more confused, because you posted an example that doesn't work on your computer, but does on mine. Do I have some kind of Ultra Firefox or something?
On Firefox (I am using the most recent version for macOS) I see only only about a paragraph of text, plus header and sidebar.
In Safari I also see pull-down menus for "Kommun" and "Tidsperiod för bokningsbara tider", plus other input items, and a description like "Antal mottagningar: 23" plus a list of locations.
I see menus at the top, a heading, a paragraph of text, some dropdowns like "kommun" and "Tidsperiod för bokningsbara tider", checkboxes under "Visa mottagningar som har", and then what I think are a bunch of boxes for locations for appointments? When I click on one, I go to that location.
Got the same response with Firefox, temporarily disabled uMatrix and it no longer complained.
It's just a shitty as website by a shitty corporation for shitty ends I guess... I never have such issues with sites that benefit me when I visit them :P
I don't have uMatrix or other ad blocker installed.
I turned off all "Enhanced Tracking Protection" and still see nothing in Firefox.
I don't know what you mean by "by a shitty corporation for shitty ends ... sites that benefit me". It's run by the regional council (https://en.wikipedia.org/wiki/V%C3%A4stra_G%C3%B6taland_Regi...), which is the political organization responsible for the area's public healthcare system. The page lists available COVID vaccination appointments, which benefits me as I was looking to get a booster shot and wanted to know where to go.
I'm sorry, I should have made clear I was referring to the Adobe site :/ Which, to be fair, I didn't attempt to actually use, it's just that disabling uMatrix made the message that it doesn't work with Firefox go away, but I didn't attempt to use it further.
I've long been confused when reading how Firefox doesn't work everywhere. Now I'm even more confused, because you posted an example that doesn't work on your computer, but does on mine. Do I have some kind of Ultra Firefox or something?