Just general comments, I am not certain you will get replies others may or may not try to provide hard facts.

Security
I see no reason why Firefox should be considered a security risk, some may even consider it safer than other browsers.

Maintenance
That may be harder to defend, especially with the new fast release cycle, and iirc original comments from mozilla suggesting it was not to be considered a commercial enterprise type browser.

I have no idea what the latest progress is on a Long Term Stability release, or whatever the official name, but one link is http://blog.mozilla.com/blog/2011/07/19/announing-mozilla-enterprise-user-working-group/ Should that ever see light of day I have no idea what if any commitment is being given to have a sustained release programme.

This of course is not the forum for discussing such issues, but I do not know which is the best one to try.

P.S.
You would appear (per system info aside) to be using an old and insecure version of Firefox 3.6.13, the supported release should be, I think, about 3.6.24 at the moment.

I use multiple browsers, mainly Firefox and Google Chrome (and sometimes IE) for many reasons. Firefox still remains my favourite browser, but I'm really impressed with Google Chrome as well, mainly because of its speed.

Since Firefox started their Rapid Release updates since early 2001, it has frustrated many users due to the fact that every time there is a new release, there is compatibility issues with add-ons, Java script, losing customization and the like. This can require considerable maintenance on the part of IT staff if they are to service users every time there is a new release.

Based on my experience using every new Firefox Rapid Release since its inception, Firefox 8 has not been my favourite release version because I've found that it's slowed down some of my websites, especially Hotmail.

Having said so, one of the important aspects of the Firefox browser is it's high security, as far as I know, when compare to other browsers, especially the most widely used, Internet Explorer. Given that Firefox updates quite often, any security and safety vulnerabilities are taken care of much faster than IE.

Depending on what business you guys are in, this one features itself is sufficient enough to stick with Firefox. Other known factors for most users using Firefox is the huge advantage of useful add-ons available.

I've been following all the Firefox Rapid Releases and have documented them in this Firefox Review web page. You can feel free to check it out because it includes reviews and details on all the releases, including the security and safety vulnerabilities, as well as bugs, fixed in each of the updates.

Hope this helps.

Thanks for the responses. I work for a large government agency, I'm hoping to send them something or have somebody from Mozilla contact them to try to get them to keep Firefox.

I doubt Mozilla Firefox would do that since it could later have legal implications.

You oughta tell the IT department to hang on to Firefox 3.6 for another 3 or 4 months until the "solution" for those issues is released, and to update to the latest Firefox 3.6.24 version to get all the security fixes which have been released in the last year since 3.6.13 came out. You are 11 version behind the "curve".

The Firefox 3.6 versions are still being supported by Mozilla. Mozilla is going to continue with security fixes as needed for 3.6.x until an Extended Support Release (ESR) comes about next year. Each major version will be supported for 48 weeks, versus the 6 week fast release cycle for consumers.

http://news.cnet.com/8301-30685_3-20109245-264/mozilla-proposes-not-so-rapid-release-firefox/?part=rss&subj=news&tag=2547-1_3-0-20
Since that article was written the ESR has gone from 42 to 48 weeks, as I mentioned above. I don't know where that 30 weeks came from, that they mentioned.

My guess is that we won't see an ESR version until Firefox 11.0 or 12.0

Your office is right, there are indeed significantly increased maintenance costs associated with the "every release every six weeks is a major release" stance that Mozilla have taken. But the recent 8.0.1 version demonstrates that this is not only unrealistic, the perversion of the existing software numbering convention is just marketing spin. Some people might even call it deliberately misleading...

So unless Mozilla produce the promised Enterprise version that more closely resembles what does happen in the real world - infrequent major new releases, more frequent minor improvements, and bug fix versions when needed - then anyone concerned about not wasting valuable manpower will pass on the frenetic new Firefox release schedule. It also makes life extremely difficult for software suppliers who need to integrate Firefox into their products.

This problem concerns everyone interested in the value of any and all well-established, meaningful, and hitherto reliable conventions.