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

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

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

Chosen solution

Do a custom install and install each version in its own program folder to use multiple Firefox versions.

Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.

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Chosen Solution

Do a custom install and install each version in its own program folder to use multiple Firefox versions.

Create a new profile exclusively for each Firefox version.
Create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.