Depends on the system. The default on Arch Linux is local gem installs:
$ cat /etc/gemrc
# --user-install is used to install to $HOME/.gem/ by default since we want to separate
# pacman installed gems and gem installed gems
gem: --user-install
> it's entirely possible to install local untrusted addons. You just have to poke some settings that are intentionally hidden from most end users
It's possible to install unsigned addons in ESR, developer and unbranded builds of Firefox. It's no longer possible to install them in the regular release or beta versions. The hidden setting was disabled in Firefox 48.
The metadata in the commit message isn't used in any way, so you can always:
git commit --amend
I personally find it a useful default, though, i.e. there's not usually much more I want to say than "added a subrepo: [metadata...]", and, for something like this, I'd rather err on the side of too much information than too little.
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