I need a previous version of Firefox to work with a single application

I have an application requires an older version of firefox to work, can I have multiple versions installed, and if not, where can I download for a version more old (say 8)?

Do a custom installation and install each version in its own folder in program using several versions of Firefox.

Create a new profile exclusively for each version of Firefox.

Create a shortcut on the desktop with Pei 'profile' attached to the target to launch each version of Firefox with its own profile.

Tags: Firefox

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