In Firefox URL box enter about:config to view | edit your default locale search and language settings:
- general.useragent.locale
- browser.search.countryCode
- browser.search.region
- browser.search.isUS
UK values for above = en.GB, GB, GB, False
Category: Apple
Apple Operating Systems and Devices
Change Yosemite Mail Default Message Font Colour
This is a work around for setting the Message default font colour.
Create a signature with Mail -> Preferences -> Signature selecting the mail account and + button like the one below in blue or desired colour:
Hello
Regards,
Joe Bloggs
Now when you send a new message this signature will appear. If you insert your message between Hello and Regards it will be blue.
AirPort Roaming Network Configuration
The above diagram shows a home Airport network with wired (RJ-45) Airports in the Sitting room, Reception (Time Capsule) and Study (Loft) and a wirelessly connected Airport in the Conservatory connected to a HiFi system using a audio mini-jack port. Due to the proximity of the Airport HiFi it wirelessly connects to the nearest AirPort Time Capsule in the Conservatory. The wired AirPorts are connected to the LAN using a straight Ethernet cable connected to the WAN 
port and nearest room RJ-45 wall port.