The data is encrypted, so not even Mozilla can see the data you sync, and Mozilla is also generally pretty trustworthy, so in terms of privacy, its fine.
For passwords, its probably not as secure as trusted dedicated password managers like Bitwarden. I just use Firefox for syncing bookmarks and sometimes tabs, and Bitwarden for passwords and things like that.
Yes, and I’d recommend everyone else do so as well.
Nowadays, the main purpose of ads online is to track you and collect data about you and what you do. They’re a privacy nightmare.
Even besides that, so much ads now just contain malware and scams and other garbage. Its how I’ve seen most people get malware, especially more tech illiterate people.
I can sympathize with creators to some extent, but at the end of the day, its their problem. I have no problem supporting creators financially for them to make a living, but they need to find more moral and less scummy ways to do so. There’s absolutely nothing wrong with blocking ads and not dealing with this nonsense, don’t let anyone guilt trip or gaslight you into thinking otherwise or that this current approach to online advertising and surveillance capitalism is okay at all.
I’m not even entirely against the concept of advertising online, I think if it doesn’t track you and its well moderated and not obnoxious or spammy, it can be fine. But unfortunately 99.9% of ads aren’t like this at all.
I’d recommend reading this note from the creator of uBlock Origin as well on their GitHub page.