Firefox was really pesky last week - every day (perhaps even more often - I'm not sure) it popped up a notification saying that version 63.0.1 was available and suggesting I download it. Until today PortableApps did not say it was available, so I kept clicking "Not Now" on the notification until I could upgrade through PortableApps. In the Options, there are only two choices: "automatically install updates" or "check for updates but let you choose to install them". Thunderbird has a third choice, "never check for updates" (which of course they warn against, but PortableApps takes care of it), but Firefox doesn't.
So, is it safe to let Firefox install updates when it starts pestering me? Or do I need to keep clicking "not now" until PortableApps offers to do it?