>Before Firefox went multi-process it handled package updates just fine No, the problem was just less common and things randomly stopped working or crashed ins

>Before Firefox went multi-process it handled package updates just fine No, the problem was just less common and things randomly stopped working or crashed instead of getting the warning page. In theory you can design the browser so it keeps all files open and passes down the handles, but I imagine it's a mess to do that in practice, especially as Firefox is still somewhat configurable.