Odd happening with Firefox

[Mike Clarke]

I'm experiencing a  problem that only happens with Firefox on FreeBSD.

I'm running 10.3-RELEASE-p7, in the past I've always managed to access  
/http://www.cumbria-libraries.org.uk//[1] but recently I've started to consistently get 404 
errors with Firefox (both firefox-47.0.1_2,1 & firefox-esr-45.3.0,1) but the page works 
without problems with Chrome, Midori, Konqueror and Lynx. The page also works fine with 
firefox-47.0.1 on Windows 7 and  firefox-46.0.1 on Linux Backbox.

This makes it look very much like a FreeBSD specific issue with that site but to help me 
establish if it's a general problem or something unique to just my system could somebody 
try to access /http://www.cumbria-libraries.org.uk//[2] with Firefox from a FreeBSD system 
and let me know what happens. It should give a 301 redirect to 
/http://cmbr.ent.sirsidynix.net.uk/client/en_GB/default//[3] - the home page for the Cumbria 
Libraries Interactive Catalogue. With Firefox I see the 301 redirect but then get an 
immediate 404 error from cmbr.ent.sirsidynix.net.uk.

I'm trying to think what could cause the server to send me the 404 when I use Firefox, it's 
not caused by the user agent string because I've tried both lynx and fetch with the user 
agent string set to match Firefox and they both work OK.

-- 
Mike Clarke

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[1] http://www.cumbria-libraries.org.uk/
[2] http://www.cumbria-libraries.org.uk/with
[3] http://cmbr.ent.sirsidynix.net.uk/client/en_GB/default/