You have disabled Safe Browsing. That prevents files from being checked for malware, so all downloads are blocked by default (nothing to do with Firefox). As you noted, you can override the warning to download anyway, but it is an extra step to try to reduce the chance of someone accidentally running a malicious program.

That’s how it’s made. They melt cheese with emulsifying salts, squirt it into a plastic envelope, and it cools into the shape of the wrapper.

This will not be a popular thing to say in Lemmy, but I don’t think self hosting those things is going to reduce your headaches. I have worked in IT all my life, and I have lots of experience running services of all kinds, including my self-hosted home stuff. Nowadays, I am very mindful of the cost in time and hassle to DIY rather than let someone else handle it. When it comes to calendars, everything I see has an option to integrate with Google or Outlook, so I can’t imagine how sharing and syncing are going to be better if you move to some obscure open source thing. I fought that exact battle for an entire decade - you don’t want to get me started talking about CalDAV - and my life got so much easier when I gave up and moved my stuff to a standard provider.

This post is basically what the Lemmy community has become, in a nutshell. I thought there would be a mass exodus from Reddit but it seems like the only people who came here and stayed are far out on the fringe. Between this kind of stuff and “I refuse to own a car because the infotainment system is not open source!”, I find myself more and more gravitating back to Reddit for some normality… which is a hell of a thing to say.

This is how it should work. I don’t want to have to sign up on every different service. If people I want to follow choose to post stuff there that I want to read, I can do so from my Mastodon account.