I think this happened because a bandwidth limit for my packacecloud.io account has been exceeded.

Please try to manually download and install DEB file/package for connector instead of using packagecloud.io repository. And if you want to remove the error when running apt update, you can remove packageclud.io repository by deleting "/etc/apt/sources.list.d/firefoxpwa.list".

This happened because download URL for 32-bit Firefox has changed. I recommend you use 64-bit version if you can, otherwise, I will release a new version with a fix soon.

Edit: This should be fixed in 1.1.1 which I just released. However, It may take a few hours before this version is available on Firefox Add-ons Store and package managers.

You can enable XDG portals by setting `widget.use-xdg-desktop-portal` to `true` in `about:config` inside PWA profile (you can open `about:config` by pressing F6 and then typing it into the popup).

It seems Firefox by default never uses XDG portals, but distros with KDE instead set some environment variable (`GTK_USE_PORTAL=1`) that makes Firefox use portals. However, because FirefoxPWA launches the default Mozilla-provided Firefox without setting any additional environment variables, Firefox won't use portals unless you manually enable them in `about:config`.