I am on Firefox on Android, ver. 119.1.0 on a Samsung Galaxy Z Flip 5. I have not been able to use Firefox to log into my accounts using other apps. To further explain, I will use the Chewy app on Android as an example. When I try to sign into my Chewy account on the app, it would prompt Firefox to open up the log-in page for Chewy. I would type in my account information and enter the "log in" button, but the app-generated Firefox window would not load onto the next page nor close the page to finish the log-in on the app; all I see is a blank page after I click the "log-in" button. I have this problem across all third-party apps that opens up a browser window to finish the in-app log-in process. I've tried force stopping Firefox, clearing cache, and even deleting and reinstalling Firefox in hopes that it would fix the problem. So far, none of these have been successful, and updates have not addressed the issue yet. Because of this problem, I cannot use Firefox as my default browser on my phone although I would much prefer to.