firefox-esr 102.2.0-r1 breaks mobile-config-firefox and existing profiles

Describe your issue

The firefox-esr package version 102.2.0-r1 (aports commit 525736254c52aa7dc0c9c7d7fdfef94dae3eba1c) moved the installation directory from /usr/lib/firefox/ to /usr/lib/firefox-esr/, and now expects to find profiles in ~/.mozilla/firefox-esr/ instead of ~/.mozilla/firefox/.

What's the expected behaviour?

Firefox ESR should use the existing profiles and use the mobile-friendly UI settings.

What's the current behaviour?

Firefox ESR creates a new profile on the first start after update to 102.2.0-r1 and shows the desktop UI.

How to reproduce your issue?

Update the firefox-esr package to 102.2.0-r1 and restart Firefox.

What device are you using?

pine64-pinephone

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v22.06

• v21.12 (supported until 2022-07-12)

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Phone environments

• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway)

Other

• No environment ("none" in pmbootstrap)
• GNOME
• KDE Plasma
• Kodi
• MATE
• Shelli
• Sway
• Weston
• Xfce4
• LXQt
• fbkeyboard
• i3wm
• Sxmo (Xorg/Dwm)
• console UI
• framebufferphone

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

Workarounds

• Copying /usr/lib/firefox/mobile-config-autoconfig.js and /usr/lib/firefox/defaults/pref/mobile-config-prefs.js to matching locations in /usr/lib/firefox-esr/ makes mobile-config-firefox work again. I assume that change should be applied to the package.
• It's possible to migrate an existing profile by copying the profile subdirectory of ~/.mozilla/firefox/ to ~/.mozilla/firefox-esr/ and adding a matching profile entry to ~/.mozilla/firefox-esr/profiles.ini. I'm not sure if there's a good way to automate this migration, an edge blog post warning users might be sufficient.