HPCC-11145 FireFox is unable to do "inline" downloads

The same is true for ie <= 9

Fixes HPCC-11145

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5647 from GordonSmith/HPCC-11145

HPCC-11145 FireFox is unable to do "inline" downloads

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>