Firefox blocks pop-up windows, but you can allow specific sites to create pop-up windows when needed.

Firefox blocks pop-up windows by default. When a website tries to launch a pop-up window, Firefox blocks it but also displays a warning. Click the warning to allow pop-up windows on that site (Figure 1)

Figure 1:
FireFox notice when it is blocking a pop up window

To allow a pop-up window in Firefox, do the following:

1. Launch Firefox.
2. When you are on a website that attempts to launch a pop-up window, Firefox will block it and will display the following warning at the top of the page: "Firefox prevented this site from opening a pop-up window" (Figure 1, above)
3. Click the Options button on the warning message and do one of the following:
   3a. Select Allow pop-ups for <site name> to allow all pop-up windows for that specific website.
   3b. Select Show <address> to allow the pop-up window to appear one time only. Future pop-up windows on the same site will continue to be blocked.

Pop-up windows are now allowed (using step 3a). If you are trying to access a website that uses pop-up windows, you may need to reload/refresh the page to allow the pop-up windows to appear.

Allowing Pop-Up Windows in Safari

To allow pop-up windows in Safari, you must disable the pop-up blocker.

Pop-up windows are blocked by default in Safari (Figure 1). To allow pop-up windows in Safari, you must disable the pop-up blocker.

Figure 1:

To disable the pop-up blocker in Safari:

1. Launch Safari.
2. Click Safari →  Preferences from the menu bar at the top of the screen.
3. Click the Security tab.
4. Remove the check mark from the box labeled Block pop-up windows (Figure 2)
   
5. Close the Preferences window.
   
   

Figure 2:

Pop-up windows will no longer be blocked by Safari. If you are trying to access a website that uses pop-up windows, you may need to reload the page to allow the pop-up windows to appear.

Chrome blocks pop-up windows by default. When a website tries to launch a pop-up window, Chrome blocks it but also displays a warning. Click the warning to allow pop-up windows on that site. The Warning typically appears in the address bar at the top of your screen (Figure 1).

Figure 1:

To allow a pop-up window in Chrome:

1. Launch Chrome.
2. When you are on a website that attempts to launch a pop-up window, Chrome will block it and will display the following warning on the right side of the address bar at the top of the page: Pop-up blocked (Figure 1, above)
   • After a moment, this warning message changes to a small icon that looks like a box with a red X on it.
3. Click the pop-up warning and select Always allow pop-ups from [website URL]. Then click Done.
   
   

Pop-up windows are now allowed. If you are trying to access a website that uses pop-up windows, you may need to reload the page to allow the pop-up windows to appear.