Your example asking about Fx25.0.1 for en-US language just download this single fileĪlthough as I said earlier it is not really a good idea to use old unsupported unsafe versions of Firefox. macOS Sierra 10.12.3 Flickering video? /questions/1164038.I note you also have another question open, but as I am not a Mac user I think it better that someone else tries to answer that: (Mainly intended for corporate use but that does not prevent you from trying it of you wish) Scroll down and click the entry under Web browser. The Windows Settings app will open with the Choose default apps screen. To do so, click the Use Firefox as my default browser button. If you do want to try an older version I would not try Firefox 25 I would suggest you try Fx52esr at least that is updated with critical security fixes. When you open Firefox for the first time, you will be asked if you’d like to make it your default browser. Profile Manager - Create, remove or switch Firefox profiles.If you do run an additional version of Firefox make sure you create a new profile for that version If your machine has the resources you may even run Firefox versions simultaneously side by side for comparison, however that is not a good idea if you are running in to issues with performance or lack of memory. You should note that more than one version of Firefox may be installed at the same time.
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