Warn users when opening an external link

[john-light]

On the recent transactions section, for example, there is a "view details" button that will automatically open a link to an Etherscan web page. There is no indication that this opens a web page to a third party service.

Proposed solution
Show a pop-up window that says something like:

"This will open a link to an external web page: https://etherscan.com/....... Continue / Cancel"

With the option to copy the link by clicking a little "copy" icon next to it (in case the user prefers to open the link in a non-default browser, or cut out the txid but discard the rest of the link).

[floating]

This functionality is in 0.2 and will be officially released soon