https://apps.microsoft.com/detail/9ncc7jnqp53t?hl=en-US&gl=US

4- kind of yes, if you count wsl

In my experience, there was a period when Firefox crashed all over the place, especially under heavy load. Tabs shared the same process back then, one tab could take down whole the browser session when crashed. I vividly remember how it felt so silky when i switched to chrome. Now I am back to Firefox since 3 years. Firefox is the sexier now with all the shiny addons