[manjaro] Firefox starts slowly

Problem

After a system update, Firefox starts very slowly. Previously, there was no problem with it.

Solution

According to this forum post, there is a bug with xdg-desktop-portal-gnome. Workaround solution:

sudo pacman -Rdd xdg-desktop-portal-gnome
sudo pacman -S xdg-desktop-portal-gtk

I have Xfce environment and it solved the issue.