In a response to local company email about IE 8 RC, I took some time to write an email to the internal mailing lists of Raya about testing websites with different browser versions. I found it good to share with the blog readers here, and, I know the company policy in Raya emphasizes sharing knowledge and efforts with the community.
Here is the email I sent:
For developer and QA testing I highly recommend using IE Tester http://www.my-debugbar.com/wiki/IETester/
It enables testing the website against different versions of IE that users may be using to navigate to the website.
For testing Firefox, you can try the latest version only (because FF users usually update their browser and the rendering features are usually not that different), or you can have side by side installed versions, or different versions without installations by using Firefox Portable Edition http://portableapps.com/apps/internet/firefox_portable
Note that in certain cases, you may not need to do all of these. For example, when the website is set to run on a local company intranet, you may be knowing from the customer that users are using one of two of three versions.
This is probably VERY old piece of information to the most of us, but I hope it can be useful to someone out there!
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