Only o2 mail does not work? Do not you use an ad blocker by accident? If so, you can try to turn it off and check it again. An encrypted connection correct, without any certificate error messages?
If after the possible blocking of the ads the problem still occurs then download https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/ in the version appropriate for your system, run, do not change any options, do a scan, substitute both generated text files (FRST and Addition) for analysis. Maybe there you can see the problem.
I had the same problem and I was able to solve it. This is not the fault of the mail because on another computer and on the phone I could easily log in. It was enough to refresh the firefox settings. On google, we enter "restoring factory firefox settings" and refresh it as instructed in the first link. You do not have to clean cookies, history, etc. Regards.
The discussion revolves around a display issue with O2, where the user encounters a message displaying "All colors Paintings Restore default Set Set [Close]". Various troubleshooting steps are suggested, including changing browsers, clearing cookies, and reinstalling browsers. The user reports that the issue persists across different browsers, except for Firefox, where it works. Another user suggests checking for ad blockers and ensuring an encrypted connection without certificate errors. A solution is proposed to refresh Firefox settings to restore factory defaults, which resolved the issue for another user experiencing similar problems. Summary generated by the language model.
