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how do can i download v25 of firefox alongside my current v for browser testing of a website

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I am trying to test a new website for compatability with different browsers (including different versions) based on site visitors to date. To do this I would like to be able to test in firefox v25 and v6 as well as my current version (v26). Is it possible to download the older versions and be able to switch between the 3 versions. If it is how?

I am trying to test a new website for compatability with different browsers (including different versions) based on site visitors to date. To do this I would like to be able to test in firefox v25 and v6 as well as my current version (v26). Is it possible to download the older versions and be able to switch between the 3 versions. If it is how?

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Instill Old Versions Of Firefox

You might be able to install each in different folder re; FF25 FF26 FF27, but you may have problems with how to run each one. One thing to try is to set Win IE as the default, and use shortcut links to start the FF's.

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found out v26 is simply v25 renamed (v26 being my current version). Had to go to windows setup to download v6 - it work ok (just as download not in separate folder as only the 1 version downloaded in the windows setup. The only problem I didn't solve was that the disable CSS was rather temeramental, only working on a couple of pages and couldn't figure out how to disable images.

So basically worked to test a fully functioning site but not yet for limited functions scenarios. Thank you for the help