[grun]

Not quite. =] Arc coordinates and synchronizes across tabs (via an iframe). So Arc behaves identically whether you have one open tab with Arc or 100.

[na85]

Aren't tabs supposed to be sandboxed?

[fomine3]

Origin should be sandboxed rather than tabs, isn't it?

[not_really]

Sounds like the iframe is used to glue sandboxes together

[BiteCode_dev]

Nicely done.