This is now possible using snapd's parallel installs feature¹:
$ sudo snap set system experimental.parallel-instances=true
$ sudo snap install firefox
$ sudo snap install firefox firefox_esr
$ sudo snap refresh firefox_esr --channel=esr/stable
$ sudo snap install firefox firefox_beta
$ sudo snap refresh firefox_beta --beta
$ sudo snap install firefox firefox_nightly
$ sudo snap refresh firefox_nightly --edge
$ snap run firefox
$ snap run firefox_esr
$ snap run firefox_beta
$ snap run firefox_nightly
¹ https://snapcraft.io/docs/parallel-installs
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https://bugs.launchpad.net/bugs/1515125
Title:
Ability to install Firefox Developer Edition on Ubuntu together with
stable release
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