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I can't speak to why they upgraded without asking you. However, 3.6 has been end-of-lifed and will no longer receive security updates. You'll be much better off using the Extended Support Release.

Mozilla doesn't make it easy to find the ESR download page. It's here:

https://www.mozilla.org/en-US/firefox/organizations/all.html

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You will not be able to install multiple versions of Firefox side by side. You'll need to use Firefox Portable Edition if you intend to have multiple instances.

That's a really helpful link. I had not idea there even was such a thing. Thanks.

It's targeted primarily at enterprises and only gets updated (aside from security patches) every 7 releases (42 weeks).

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