block old versions of firefox with htaccess?

Is there any way to block older versions of firefox via htaccess? In reviewing my logs, we seem to be taking on a lot of "fire" with firefox 40.1. I think that if I'm able to block that particular browser, a lot of problems would be solved.

Anyone know how exactly to do this?

You can block them through User Agents detection. Something similar:

RewriteCond %{HTTP_USER_AGENT} ^.*Firefox/40.1*$
RewriteRule .* - [L]
RewriteRule ^.*$ - [F,L]


I think you would test this block, so you could create a redirection on a "go away page". Just change the last line (RewriteRule ^.*$ - [F,L]) as something similar:

RewriteRule .* http://mydomain.com/nooldffxthanks.html [R,L]

Hope this can help.

Thank you. I will give this a try and report back.