Firefox-TM1Web/Contributor decimal separator not per locale

[gtonkin]

Does anyone know how to change the locale setting in Firefox? My issue is that the decimal separator is a comma and not a point (period) - makes entering of data tricky as 1,234 is not interpreted by users as 1.234 - comma is generally the thousand separator.

I have fiddled with Firefox to set the Locale in about:config, general.useragent.locale and Tools, Option, Content - no luck.
I have checked that the services start with a profile linked to en-za which has a decimal point as a separator.

If I switch Firefox to render using the Fire IE add-in, I get what I am looking for (on my PC at any rate)
Opening under IE seems to give the correct locale too. Appears that IE is using my computers regional settings

I can find some articles relating to an issue with copying and pasting but nothing found so far that has solved this issue.

p.s. would also be nice if I could sort this out on the iPad app too if anyone knows how.
p.p.s. No, I do not want to use Internet Exploder.
p.p.p.s. Have not tried on Chrome as client is using Firefox at this stage.

Thanks in advance.

[gtonkin]

Found this option: intl.locale.matchOS in Firefox and set to TRUE - no luck.