> $ find /tmp/firefox/ -name '*_linux-i686_*' | wc -l
   > 91
   > $ find /tmp/firefox/ -name '*_linux-i686_*' | xargs grep -e 'HTTP/1.[01] [23]..' | wc -l
   > 89

   > $ find /tmp/firefox/ -name '*_linux-x86_64_*' | wc -l
   > 91
   > $ find /tmp/firefox/ -name '*_linux-x86_64_*' | xargs grep -e 'HTTP/1.[01] [23]..' | wc -l
   > 0

Apparently As described in detail [[How best to install and run (on debian) a separate, downlevel version of firefox for the F5/firepass VPN?|here]], I am required to run a downlevel version of firefox to support my employer's vendor's VPN plugin (F5 Network Access Plugin, F5NAP). The [http://support.f5.com/kb/en-us/products/big-ip_apm/manuals/product/apm_compatibility_matrix_10_2_1.html vendor's docs] (scroll to "Linux Operating Systems") say that Firefox 8.x is "Supported by 10.2.1-HF2 build496.40" so I tried installing that first. Installing and running a separate Firefox 8 on my 64-bit LMDE (based on debian testing) was easy, but in both cases (8.0 and 8.0.1) F5NAP failed to install, so I'm guessing my employer is providing F5NAP version < 10.2.1-HF2 build496.40. So now I'm forced to try to install a Firefox 3.x :-( However, as before, I'm attempting to install on a 64-bit debian, and unfortunately I'm not seeing any 64-bit binaries :-( I scraped the 3.x version numbers from [https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ here], then ran this bash scriptlet ... but since this forum's formatter can't handle code with a link in it, access the scriptlet @ http://goo.gl/lPXZi The results were > $ find /tmp/firefox/ -name '*_linux-i686_*' | wc -l > 91 > $ find /tmp/firefox/ -name '*_linux-i686_*' | xargs grep -e 'HTTP/1.[01] [23]..' | wc -l > 89 > $ find /tmp/firefox/ -name '*_linux-x86_64_*' | wc -l > 91 > $ find /tmp/firefox/ -name '*_linux-x86_64_*' | xargs grep -e 'HTTP/1.[01] [23]..' | wc -l > 0 So how should I proceed to install a 3.x firefox on a 64-bit linux? Is there another source of x86_64 binaries? Should I install a 32-bit (i686) firefox and then fiddle with its configuration (and if so, how)? Should I compile from source (and if so, which version, and how)?