Here you can find a good explanation on that.
Here you can find a good explanation on that.
Mull (from the DivestOS developers)
But nowadays I’m using a Chromium based browser on my phone because Firefox on Android doesn’t support process isolation
Did you read the sentence before that? A malicious website could read data from other websites(opened in different tabs), and also passwords stored in the browser, etc… There is no additional system exploit needed for that