I have already installed in FreeBSD-11.1 "firefox-58" from package.
Trying to install also "firefox-esr" from package I got this errore message
pkg: firefox-58.0.2,1 conflicts with firefox-esr-52.6.0_2,1 (installs files into the same place). Problematic file: /usr/local/bin/firefox
After a discussion on "forums.freebsd.org" with other members of the community
I report here what were the proposed actions to fix it.
-] "firefox" and "firefox-esr" files should go to separate paths e.g.
-] "firefox" and "firefox-esr" should not share the same user profile.
This to avoid possible incompatibilities in profile between the two
Given that the two products are different and in phase of development it can
important to test a web application on both of them, It could be useful to have
both installable and running together on the same system.
I vote for this request, too.
Debian Linux, for example, has Firefox ESR by default.
Firefox (latest) can be installed additionally. It is named "firefox.real" there, and both can be run.
Is this the type of thing that _might_ be realised with flavors?