CloudFlare is a content distribution network (CDN) like Akamai. Large sites put some of their less frequently updated content on a CDN so improve the speed of loading. But bad guys with money could use it, too.

You can read more here: https://en.wikipedia.org/wiki/CloudFlare

What symptoms are you seeing that make you suspicious of the content being served from CloudFlare?

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 Shift key when starting Firefox.

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? (More info: Diagnose Firefox issues using Troubleshoot Mode)

I suspect this because I never had anything before and now many of the sites I visit gives me the CF popup. I do not trust anything that pops up and makes me click OK or SUBMIT. Either they have become very popular all of a sudden or it is on my machine and I believe the latter.

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB