Firefox feels the need to scream at me every time it updates, which is all the time—far more often than iOS, and far more often than Safari. I think that's what the GP meant.
FF does the equivalent of a major iOS update several times per year, as far as the user experience of the update is concerned—iOS doesn't fill my screen with on-launch "hi! We updated!" notices unless the release is a big one and there's actually new stuff to tell me about, in which case they usually keep it short and to the point. FF opens & foregrounds a new tab to tell me about the exciting update (ugh) and sometimes also pops some call-out bubbles for Pocket or some other crap, way, way more often than any other software I use, and it's really annoying, especially for a piece of software I've been using exactly the same way since it was called Phoenix and before some of the people working on it were born, probably—none of the shit in those announcements has ever, once, been anything I needed or wanted to know about.
This, despite monkeying with UI and force-foregrounding unrequested content being UI poison for people with low computer literacy. I roll my eyes and close the crap; others get confused and are significantly delayed in doing whatever they actually wanted to do with the browser, on top of feeling confused and betrayed that their browser did something different when they opened it this time.
I don't remember the specifics of how to do it, but you can disable the Firefox upgrade welcome tab...
My Firefox install hasn't bothered me by opening any unwanted tabs in a couple years, at least? But it still updates on a system restart or when I tell it to -- it just reloads all the previously opened tabs without any UX burden.
FF does the equivalent of a major iOS update several times per year, as far as the user experience of the update is concerned—iOS doesn't fill my screen with on-launch "hi! We updated!" notices unless the release is a big one and there's actually new stuff to tell me about, in which case they usually keep it short and to the point. FF opens & foregrounds a new tab to tell me about the exciting update (ugh) and sometimes also pops some call-out bubbles for Pocket or some other crap, way, way more often than any other software I use, and it's really annoying, especially for a piece of software I've been using exactly the same way since it was called Phoenix and before some of the people working on it were born, probably—none of the shit in those announcements has ever, once, been anything I needed or wanted to know about.
This, despite monkeying with UI and force-foregrounding unrequested content being UI poison for people with low computer literacy. I roll my eyes and close the crap; others get confused and are significantly delayed in doing whatever they actually wanted to do with the browser, on top of feeling confused and betrayed that their browser did something different when they opened it this time.