unable to take a screen shot because of security why?

I wanted to take some screen shots and found my self in a goggle browser instead of Firefox browser and as a result I could not take screen shots because Google says it is because of security. Please explain to me which security, I chose Firefox default, browser etc. But It is seems as if Google want to over in everything I do on my cell phone. Thank you ''Moderator note: Moved from the Firefox Desktop forum to the Firefox for Android forum.''