Hi   !

Your system details show that you have three versions of Shockwave Flash installed. Having more than one version of a program may cause issues. You must remove the older programs,   and then get the current full installer.

Flash: Grab the uninstaller from here:

https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Then reinstall the latest version.

Flash Player Version: 25.0.0.171

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the active_x.

https://get.adobe.com/flashplayer/

Note: Optional offer: McAfee Security

Let's try Firefox in Safe Mode : If Firefox is not running : Hold down the Shift key when starting Firefox. If Firefox is running : 3-bar menu => ' ? ' (at the bottom of the dropdown) => 'Restart with Add-ons disabled'. Then OK the restart. A small dialog should appear. Click 'Start in Safe Mode' ( not 'Refresh' !)

See : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Do you use any security software that might "sandbox" Firefox or other browsers? A sandbox is a separate program that isolates whatever is running inside it from the rest of your system to help reduce the potential for damaging attacks from web content. A colored border is one way a sandboxing program might indicate that Firefox is protected (or Windows is protected from Firefox, depending on how you look at it).