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I do not want an update to kill all my add-ons, but also would like to enjoy the advantages of FireFoX qua**um.

How can I install one of them next to the other one?

Linux can be installed without overwriting Windows/default OS (some PCs ship FreeDos). But what about applications?

Windows allows installing onto an alternative directory.

neverMind9
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  • Firefox Quantum can't be used with older addons and older versions don't have the improvements of Firefox Quantum. Just so you know, installing two versions isn't going to change that. – Chai T. Rex Jan 19 '18 at 20:54
  • I know, @ChaiT.Rex. That's why they should be installed separately but **both can run simultaneously.** Independently fron each others. Just like Chrome,Opera,Vivaldi,Firefox. – neverMind9 Jan 19 '18 at 21:04
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    Possible duplicate of [How to run firefox and firefox ESR simultaneously](https://askubuntu.com/questions/904735/how-to-run-firefox-and-firefox-esr-simultaneously) and [How to install an old version of Firefox side-by-side to default version without conflicts?](https://askubuntu.com/questions/770740/how-to-install-an-old-version-of-firefox-side-by-side-to-default-version-without/770769#770769) – karel Jan 20 '18 at 05:22

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