Moved from Firefox Dev Edition to Librewolf. No deal breakers yet.
Procedure to transfer over painlessly:
Install and run Librewolf.
On both browsers go Help > More troubleshooting information > profile folder > Open.
Close both browsers.
Delete everything inside the librewolf profile.
Copy everything from Firefox Dev profile directory into Librewolf profile directory.
Run Librewolf with "--allow-downgrade" once.
First run was a tad slow with extensions doing some 'recombobulation'.
You can now run Librewolf normally without the above allow downgrade option.
Enjoy.
Procedure to transfer over painlessly: Install and run Librewolf. On both browsers go Help > More troubleshooting information > profile folder > Open. Close both browsers. Delete everything inside the librewolf profile. Copy everything from Firefox Dev profile directory into Librewolf profile directory. Run Librewolf with "--allow-downgrade" once. First run was a tad slow with extensions doing some 'recombobulation'. You can now run Librewolf normally without the above allow downgrade option. Enjoy.