Blue box around adsense blocks

Is this a new thing?

[joeking]

Today I have started to see blue boxes around Google Ads that would otherwise have no border (ie background blended into the page colour).

Anyone else seeing this? Is it new or some sort of problem? I've seen it on three sites now.

[joeking]

Only showing with Firefox by the way, not IE (thank the Lord!)

[Jafo]

I am not seeing this on any of my sites.

[celgins]

I haven't seen this at all today.

[joeking]

Sorry - false alarm!

I checked it on another computer and the blue box had gone.

Came back to my computer and discovered that I had "outline frames" switched on.

Apologies everybody.

A moderator is welcome to delete this thread to prevent any heart attacks.