Pop-up permission controls when checkout or login windows do not open
Checking Browser Pop-Up Settings Before Retrying Payment or Login
The most common reason a checkout or login window does not open after a click is the browser built-in pop-up blocker. Desktop browsers usually show an icon near the address bar, something like a small window with an X.

Clicking that reveals a way to allow pop-ups for that one site. On mobile, the setting lives in the site information menu. Restricting permission to just that site rather than switching a global toggle is the safer choice.
Checking the Site’s Pop-Up Permission in Your Browser Menu
When you are not seeing a blocked pop-up indicator, go into the browser settings and search for “pop-up.” Most lists have the current site under permission controls. A block setting should be changed to allow, then reload the page. A related piece is redirect or intent permission specifically for login windows. Allowing pop-ups for a site does not always help when this separate redirect gate is also on block.
Flipping that option can sometimes resolve what looks like a pop-up failure.
Testing the Pop-Up Permission After Saving the Change
Back on the page, click that same payment or login button. A separate tab or window opening quickly means the permission change stuck. But a stuck condition can still occur. Watch if an in-page overlay appears instead of a separate new window. A modal does not represent a pop-up enforcement violation.

Even with correct permissions, a window that still does not open may indicate an expired session or an unresponsive payment field entry. Refreshing the page and starting the checkout or login process again often clears these temporary issues.
Clearing Cache and Session Data When Permissions Do Not Help
Pop-up permissions set correctly but the window still does not open suggests the browser cache or session data may be causing a conflict. Most browsers offer a “clear site data” or “clear cookies and cache” option in the site information menu or settings panel. Clearing the cache and cookies for the specific site can remove stored settings that interfere with the window opening.
After clearing the data, reload the page and log in again if needed. Then click the checkout or login button once more. This step often resolves issues that pop-up permission changes alone cannot fix. A window that still does not open after clearing site data calls for trying a different browser or a private browsing window to rule out extension interference.
FAQ
Question: Why does the checkout window open on one browser but not another?
Answer: Each browser stores its own pop-up permission settings. Check the pop-up permission for the same site in the browser where the window does not open. The setting may still be block in that browser even if it is allow in another.
Question: Will allowing pop-ups for a shopping site make my browser less secure?
Answer: Allowing pop-ups for a trusted site you are actively using is generally safe. The risk comes from allowing all sites globally. Keep the permission set to block by default and allow only the specific site where you need the checkout or login window to open.
Question: What should I do when the pop-up setting is already set to allow but the window still does not open?
Answer: Check whether the site uses a modal overlay instead of a separate window. When no overlay appears, clear the site’s cache and cookies, reload the page, and try again. A persistent problem should be tested in a private browsing window or a different browser to see if an extension is blocking the window.