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downlaod earlier firefox
how to downlaod earlier firefox
how to downlaod earlier firefox
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If you need to verify something, I'd recommend https://mozilla.github.io/mozregression/ that can launch any version in a separate profile.
All releases are otherwise available at https://archive.mozilla.org/pub/firefox/releases/
If you actually plan to use an older Firefox going forwards, there's a maintained Firefox ESR release cycle branch: firefox.com/download/all/desktop-esr
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