Samsung S3, backup contacts to PC

[ppppenguin]

I know gmail is meant to be simple to use but I'm getting confused. I thought I had jeffreyborinsky (xxxatxxx) gmail[dot]co[dot]uk but gmail says this is already taken. A bit surprising as there aren't many Jeffrey Borinskys around the world. I have had google (xxxatxxx) borinsky[dot]co[dot]uk as an address registered with gmail for a long time but of course that isn't a gmail address. I have just registered ppppenguin99 (xxxatxxx) gmail[dot]com which gmail now says is my primary address on my google account. The latter 2 are definitely active. I suspect the jeffreyborinsky isn't mine. I've sent a test email to it so somebody may be getting a surprise.

How do I make gmail pick up the contacts list from my phone? I use Firefox as my main browser though I have Chrome installed.

I've created a gmail account on my PC though I think I already had one.