I just updated to version 10 and wish to downgrade to version 9. None of my security software is compatible with 10. Where can I download version 9. Version 3.6, which is available on the website, is farther back than I want to go. Thank you.

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Answer 1

_nat_
You're better off with almost anything accept ZA and Kaspersky, they both are absolutely the worst security vendors at keeping up with Firefox updates this past year - each has had at least one Firefox add-on being many weeks or months behind Firefox's release schedule. It's almost like they don't know about the Firefox 18 week development process and they wait until their Firefox users complain about their crap not working with a newly released version of Firefox before they even think about doing their updates. IMO, the smart thing to do is to test the Nightly channel version (first 6 week alpha stage) for compatibility issues once a week to see what problems might exist with their software, and once the new version hits the Aurora channel (2nd 6 week alpha stage) start formulating a plan, schedule for what they need to be fixed and start fixing their stuff, while stepping up testing a bit. Once the new version hits the 6 week Beta channel they should be completing their fixes and expanding their testing to include combination's of the most popular add-ons being used by Firefox users so they can see any problems their users might run into and fix what needs to be fixed before the release of the new Firefox version.
One other thing that these security vendors could do is to have some of their customers do their Beta testing to find the faults and weak spots in their stuff, much like open source organizations like Mozilla does with Firefox. While I'm not a computer software professional, I have 3 different Nightly versions installed that I "test" a bit almost everyday for the simpler stuff, and the Aurora version, along with the Beta version. Over that last 6 or 7 years I have found 3 or4 pretty severe faults that I filed Bug reports about, one of which resulted in the developers providing a much sterner warning message about the risk of data loss and the other Bug reports helped the developers by making them aware of a potential problem early enough in the development that is wasn't hard to avoid the issue I pointed out to them with some minor coding changes.
Free or paid version, if these security companies are going to create and distribute a Firefox add-on the right thing to do is to keep it up to date with Firefox, or they should just discontinue the add-on and quit jerking us around with their irresponsibility and lackadaisical attitude toward Firefox. I honestly miss the "good old days" when these security companies ignored Firefox and only supported Internet Explorer.
I use Avira Personal Free - http://www.free-av.com/ - which doesn't feel the need to build add-ons for Firefox that really don't add anything to Firefox and only provide a "bells & whistles"version of something that is already built into Firefox. Good solid anti-virus protection that is updated twice daily.