But aren't HTTPonly coookies stored in a SQLite db, and have no password attached in Firefox or Chrome?
localStorage is totally accessible to any JavaScript running on the page, so your session can be completely hijacked and used later.
Not completely true - the attacker can not exfiltrate the token but they can still make malicious requests right there in the victim's browser via XSS.
If you can inject javascript, it's game over anyway.
> HTTPOnly cookies are safe from XSS attacks.
No, you can still do pretty much anything that cookie enables you to do. You just can't get the actual cookie string.
Yeah, but as you pointed out the one thing you can't do is get the cookie. Having the auth token yourself as the attacker is a way different story then just having XSS vulnerabilities. You can still "do" a lot, but you still have to get another user with the token you want to interact with the page with your XSS to "do" what you want.
You need to do this in both cases.