See https://support.mozilla.org/en-US/kb/mixed-content-blocking-firefox

Still not sure how to enter the webpage?

I think this is in the article, but a gray lock with a yellow triangle means Firefox is only warning you about insecure "display content" (like images) in a secure page, and actually not blocking anything. Is this a site you can link us to or something that is internal or where you need an account? ---- General suggestions: When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site. (1) Clear Firefox's Cache See: [[How to clear the Firefox cache]] If you have a large hard drive, this might take a few minutes. (2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either: * right-click (Mac: Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies" * (menu bar) Tools > Page Info > Security > "View Cookies" * click the padlock or globe icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button In the dialog that opens, you can remove the site's cookies individually. Then try reloading the page. Does that help? ---- Could you test in Firefox's Safe Mode? In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem. ''If Firefox is not running:'' Hold down the Alt/Option key when starting Firefox. (on Windows, hold down the Shift key) ''If Firefox is running:'' You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" button > Restart with Add-ons Disabled * Help menu > Restart with Add-ons Disabled and OK the restart. ''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh). Any improvement?