Looking on the internet deeply has found these results:

in popup is the most popular phrase on the web.

on popup 1104,000 results on the web	in popup 1738,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
clicking on any tab will popup another menu: Whether to show popup notifications when away or busy. Prompt every time a popup window is requested. Right You can enter a scheduled transaction manually by right clicking on the list entry and selecting Enter from the popup menu or by clicking on the Enter button on the popup window in the calendar view. Whether to show a popup notification when a contact goes online. Whether to show a popup notification when receiving a new message. Maintain Aspect button corresponds to the command on the general popup menu that will toggle the option to maintain the video aspect ratio.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

on popup

1104,000 results on the web

in popup

1738,000 results on the web

More popular!

clicking on any tab will popup another menu:
Whether to show popup notifications when away or busy.
Prompt every time a popup window is requested.
Right
You can enter a scheduled transaction manually by right clicking on the list entry and selecting Enter from the popup menu or by clicking on the Enter button on the popup window in the calendar view.
Whether to show a popup notification when a contact goes online.
Whether to show a popup notification when receiving a new message.
Maintain Aspect button corresponds to the command on the general popup menu that will toggle the option to maintain the video aspect ratio.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.