Imagine your friend that does not know anything about linux, don't you think this would make them not install the firefox flatpak and potentially think that linux is unsafe?
I ask this because I believe we must be careful and make small changes to welcome new users in the future, we have to make them as much comfortable as possible when experimenting with a new O.S
I believe this warning could have a less alarming design, saying something like "This app can use elevated permissions. What does this mean?" with the "What does this mean?" text as a clickable URL that shows the user that this may cause security risks. I mean, is kind of a contradiction to have "verified" on the app and a red warning saying "Potentially unsafe", the user will think "well, should I trust this or not??"
When I look at Firefox in Discover, it only shows the list of permissions the flatpak will be given out of the box, with no warning of it being "potentially unsafe." This certainly does seem like the better way to handle it.
Also, the warning on the Flathub website is clickable - it expands into the full permissions list. Why it defaults to "no information except maybe dangerous" is beyond me.