Thank you for your reply.
Now, this is kinda scary, because when I posted this morning, Truster Endpoint Protection was in my toolbar and it has been there for about a week. When I got home tonight and woke up my Mac, I check my emails, read your reply and I looked in my toolbar and Truster Endpoint Protection wasn't there. I don't have any idea how it got in my toolbar. It just showed up one day and I didn't notice it was there until I took a screenshot and it popped up a warning screen and I wondered where it came from. Now it's gone and I'm freaking out because it went the same way it came and I'm wondering what it might have gotten from my computer before it went away and maybe 'phoned home' with to someone before leaving. Thanks for the heads-up on Malwarebytes Anti-Malware for Mac. I downloaded and installed it, ran it and it found nothing, but Truster Endpoint Protection wasn't there either. I haven't had a chance to search the web and see what it is supposed to be or how I got it in my Safari toolbar. Anyway, just to recap, It was in my toolbar when I wrote the post you replied to and I put my computer to sleep before leaving and when I got home tonight and woke up my computer, read your email and looked for it, it wasn't in my toolbar anymore!!!
To answer your question, I didn't click on View to see if the dropdown said to see if it said "Show Toolbar", but next time it happens, I will look and get back to you on that.
Also, yesterday morning, I woke up my computer, had one Safari window open that had the toolbar that had the URL field and other buttons and I needed another Safari window, which I opened and it didn't have that toolbar in it . So I closed that window and opened another and the same thing, that bar wasn't there either. Now I forgot to mention that I have another toolbar for RoboForn plugin, which was there in all the windows, even when the bar which has the URL field on it was gone. However, last week the same thing happened and the toolbars for the URL field and RoboForm were both gone. It doesn't make sense to me and probably doesn't make sense to you either. If it happens again or the Truster Endpoint Protection button comes back, I'll run Malwarebytes Anti-Malware for Mac while it's there and see if it finds any malware or adware and then I guess getting rid of it means dragging it to the Trash. Then I'll reply back to you again and give you an update. If in the 'View' dropdown it shows I haven't hid the toolbar[s], I'll definitely post to see if you or anyone has any idea how to get my toolbar[s] back directly.
Thanks again