It's important to note that apparently there's no automatic migration path and this will be only used for new profiles, so you have to migrate manually.

Good gawd, finally.

https://specifications.freedesktop.org/basedir/latest/

The XDG Base Directory Specification is based on the following concepts:

There is a single base directory relative to which user-specific data files should be written. This directory is defined by the environment variable $XDG_DATA_HOME.

There is a single base directory relative to which user-specific configuration files should be written. This directory is defined by the environment variable $XDG_CONFIG_HOME.

There is a single base directory relative to which user-specific state data should be written. This directory is defined by the environment variable $XDG_STATE_HOME.

There is a single base directory relative to which user-specific executable files may be written.

There is a set of preference ordered base directories relative to which data files should be searched. This set of directories is defined by the environment variable $XDG_DATA_DIRS.

There is a set of preference ordered base directories relative to which configuration files should be searched. This set of directories is defined by the environment variable $XDG_CONFIG_DIRS.

There is a single base directory relative to which user-specific non-essential (cached) data should be written. This directory is defined by the environment variable $XDG_CACHE_HOME.

There is a single base directory relative to which user-specific runtime files and other file objects should be placed. This directory is defined by the environment variable $XDG_RUNTIME_DIR.

I tried it and moved the directory. Results:

• Firefox opens, settings from the profile are still there.
• Empty ./mozilla/extensions directories are recreated on startup.
• Firefox cannot show any websites anymore.

Yikes.

Though, it looks like it won't auto-migrate. So it'll stay directly in your home dir unless you reinstall or move it yourself.

https://hg-edge.mozilla.org/integration/autoland/diff/8a6d6c094cb5a842d415c60bb8395db03b36e531/xpcom/io/nsAppFileLocationProvider.cpp#l1.73

Wow! Now that is something that's nice to see!

Instead of "we've inserted AI into your AI so that you can run more AI while you're running AI".

Heck yes!! One of three remaining dotfiles in my ~ (the other ones are .ssh and .XCompose, I suspect I can get rid of the latter nowadays too). Can't wait for this to land in librewolf.

This is super nice. Still a few left out but one less is good. Anyone looking to clean up their home directory can use xdj ninja .

From the bug report:

[...] will require moving some config & data files from ~/.phoenix to probably $XDG_CONFIG_HOME/phoenix and [...]

According to Wikipedia, the browser was already renamed to "Firefox" when that bug report was opened, but still wild to see that even back then, they already had some technical debt for the name of that directory.

Unfortunate that they did not go straight from ~/.phoenix to $XDG_CONFIG_HOME/mozilla, but hard to say, if that was as obvious of a choice back then...

To be honest, I don't know why this was an issue at all. I speak for myself, when I say it never actually bothered me much, as long as it is hidden and in my home directory. I will change directory to .config/firefox (or whatever is the new default), but I don't know if that makes a difference at all.

Finally!