annoying boxes

[YouveCatToBeKittenMe]

I have noticed some odd narrow box outlines around some of the graphics on mumsnet
They are not very obvious and not there all the time but because I am a perfectionist they are annoying me so I thought I'd point them out

In my brief acquaintance with web designing I think they were something to do with the slices having the wrong settings or a margin or something but don't actually know what I'm talking about can't really remember

I am using Firefox on a Mac

here are some pics
annoying box one
annoying box two

I have noticed the same thing on a bog standard PC.

I thought it was just my laptop 'having a moment' for the last week or so. Obviously not...

They are still there today.

I don't want to go on about it

but they are REALLY ANNOYING NOW

I noticed the weird boxes.

Ooh never noticed weird boxes before. Those who have been blessed by the weird boxes - what are you using? Middleaged - which browser are you using on your PC?

I see them on Firefox on a Mac