Google: Chrome Zero-Day Was Used Together With a Windows 7 Zero-Day (zdnet.com)
Google said this week that a Chrome zero-day the company patched last week was actually used together with a second one, a zero-day impacting the Microsoft Windows 7 operating system. From a report: The two zero-days were part of ongoing cyber-attacks that Clement Lecigne, a member of Google's Threat Analysis Group, discovered last week on February 27. The attackers were using a combination of a Chrome and Windows 7 zero-days to execute malicious code and take over vulnerable systems. The company revealed the true severity of these attacks in a blog post this week. Google said that Microsoft is working on a fix, but did not give out a timeline. The company's blog post comes to put more clarity into a confusing timeline of events that started last Friday, March 1, when Google released Chrome 72.0.3626.121, a new Chrome version that included one solitary security fix (CVE-2019-5786) for Chrome's FileReader --a web API that lets websites and web apps read the contents of files stored on the user's computer.
Firefox was never about being small and light weight, it was about being able to render websites faster and in a standard compliant way.
I hate to correct you, cause on other points you are right, but no.
Firefox came as spin-off from the Mozilla suite. Mozilla targeted compliant browsing.
Firefox was from day one meant as a light weight browser with only one feature: browsing websites. No composer, no e-mail, no fancies and initially not even plugins. Low on memory. Low on megabytes of code. Fast.
From there it went it's own way exactly as parent poster described.
A glitch a day keeps the bugs away.