I used Firefox for a long time with no problems. I never played with the internal settings (from about:config). One day, with version 21, I found out that every time I do a image search in Google, I could see only 15 to 20 pics correctly and all the others appeared as grey boxes. I deleted cookies and cache but nothing changed. I tried to find a solution and in a Mozilla’s forum was said to reset Firefox from “Troubleshooting Information” menu. I did it and the problem disappeared. Then, another, worse problem, appeared. All sites were tried to get opened with https in front and in all cases Firefox was telling me that the connection is untrusted and can’t confirm that my connection is secure. I was selecting “I understand the risks” and the site was appeared but it was altered, it hadn’t the look that it should have. I did a google search to find a solution. Nothing really helpful came up. In your forum I found a setting, “browser.urlbar.autoFill” that should be turned to false. I did it and the problem was fixed is some pages. Now I can open google and some other pages with no problem but some others, like yahoo mail, that require secure connection (https) cannot get accessed. I tried to uninstall Firefox using Revo Uninstaller, to be sure that all data will be deleted. I reinstalled Firefox but the problem still exists. I uninstalled Firefox again and downloaded and installed version 22 beta 3 of Firefox with the same luck. So, what’s wrong? What should I do?