If you NEED to use a legacy version of an add-on. And can’t move away from the add-on, or don’t want to use Pale Moon or the other forks of Firefox; then keep on reading! Currently the Ubuntu 18.04 PPA
If you NEED to use a legacy version of an add-on. And can’t move away from the add-on, or don’t want to use Pale Moon or the other forks of Firefox; then keep on reading! Currently the Ubuntu 18.04 PPA