No, so they invade it in simpler, more pervasive, ways

In addition to what inaccuracies people here have pointed out, remember how hard it was to get people to adopt Signal when it was easy? How are you going to get people to adopt XMPP. I love XMPP, but I’m never gonna get my girlfriend or parents to get on board for that

I use a desktop password manager and don’t bother with an extension most of the time

There are mitigations you can do, but its easier to resolve root causes by not touching risky software in the first place. I recommend people start with the easy stuff first. Messaging systems is probably the lowest hanging fruit. Mobile operating systems is a bit more messy, depending on your hardware. But installing Linux is easier than you think. Zorin is great if you’re super used to windows and don’t want to learn new paradigms at all. MX Linux has slightly more learning curve than other beginner friendly choices, but its still doable. It will also help you revive old hardware and avoid adding ewaste to the oceans. Debian is a bit more jumping into the deep end, but it still does a reasonable job of holding your hand as you get started. It will also give you a ton of flexibility to just install default programs and use those programs documentation to resolve issues rather than trying to figure out what strange customizations your chosen distro applied.