@ians1988,

I'm not sure what the answer to your question is, however, I do have a thought to share:

Do you think it is likely that the end-user would:

Option1:
1. Load up the site
2. Immediately after close out

or would it be more likely that they would:

Option2:
1. Load up the side.
2. Select either "Allow" or "Block"

3. Read a few words.

4. Then attempt to close out

In your testing, it kind of sounds like you are expecting the pop-up to show up even though there already is another pop-up in Chrome. However, I'm curious if you were to close that initial pop-up and then attempt to exit would you see your pop-up?

Mihnea Docea | Technical Support Consultant | Customer Experience | Adobe | (:: 1 (800) 497-0335