Kubuntu 从 20 更新到 22 后，Firefox 被强制从 snap 安装。之后，我无法在任何地方下载和保存任何文件，不仅仅是在主目录中。我在 Kubuntu 的软件管理器（Discover）中向 Firefox 授予了所有显式权限，但没有任何效果。此外，我在从 snap 安装的其他应用程序中也遇到了类似的问题。我还能尝试做什么来向这些应用程序授予所有权限？
UPD1. 之前的 Kubuntu 版本是 20.04.4。我更新到了 22.04。
UPD2. 输出snap connections firefox
Interface Plug Slot Notes
audio-playback firefox:audio-playback :audio-playback -
audio-record firefox:audio-record :audio-record -
avahi-observe firefox:avahi-observe :avahi-observe -
browser-support firefox:browser-sandbox :browser-support -
camera firefox:camera :camera -
content[gnome-3-38-2004] firefox:gnome-3-38-2004 gnome-3-38-2004:gnome-3-38-2004 -
content[gtk-3-themes] firefox:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] firefox:icon-themes gtk-common-themes:icon-themes -
content[sound-themes] firefox:sound-themes gtk-common-themes:sound-themes -
cups-control firefox:cups-control :cups-control -
dbus - firefox:dbus-daemon -
desktop firefox:desktop :desktop -
desktop-legacy firefox:desktop-legacy :desktop-legacy -
gsettings firefox:gsettings :gsettings -
hardware-observe firefox:hardware-observe :hardware-observe -
home firefox:home :home manual
joystick firefox:joystick :joystick -
mpris - firefox:mpris -
network firefox:network :network -
network-observe firefox:network-observe :network-observe manual
opengl firefox:opengl :opengl -
personal-files firefox:dot-mozilla-firefox :personal-files -
removable-media firefox:removable-media :removable-media -
screen-inhibit-control firefox:screen-inhibit-control :screen-inhibit-control -
system-files firefox:etc-firefox-policies :system-files -
system-packages-doc firefox:system-packages-doc :system-packages-doc -
u2f-devices firefox:u2f-devices :u2f-devices -
unity7 firefox:unity7 :unity7 -
upower-observe firefox:upower-observe :upower-observe -
wayland firefox:wayland :wayland -
x11 firefox:x11 :x11 -